WO1997000008A1 - Method of acting on convective clouds - Google Patents
Method of acting on convective clouds Download PDFInfo
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- WO1997000008A1 WO1997000008A1 PCT/GB1995/002148 GB9502148W WO9700008A1 WO 1997000008 A1 WO1997000008 A1 WO 1997000008A1 GB 9502148 W GB9502148 W GB 9502148W WO 9700008 A1 WO9700008 A1 WO 9700008A1
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- Prior art keywords
- cloud
- point
- rotation
- tangential component
- air flows
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G15/00—Devices or methods for influencing weather conditions
Abstract
A method of acting on convective clouds is disclosed which comprises the steps of determining the development stage of a cloud and its direction of movement, selecting action zones therein and forming descending air flows or introducing a crystallizing reagent into said action zones. The action zones are chosen to be at the front and back parts of the cloud, two points then being selected which are situated on opposite sides of the point of deceleration of the tangential component of cloud rotation as viewed from the front and back parts, respectively, at a distance of 1 to 10 km from the first visible side boundary of the cloud, and the point of maximum value of the tangential component of cloud rotation and at a distance of 1 to 10 km from the second visible side boundary of the cloud, ascending or descending air flows being formed simultaneously or successively in two, three or four of said action zones.
Description
METHOD OF ACTING ON CONVECTIVE CLOUDS
This invention relates to the general field of meteorology and more particularly to purposefully acting upon convective clouds to change their characteristics and thereby prevent or protect the population against the consequencies of extremely dangerous weather conditions such as drought, showers, tornadoes, electrical thunderstorms, rainfall polluted with radionuclides, CFC's from aerosols and/or dangerous gaseous products discharged into the atmosphere as a result of industrial accidents.
A known method of acting on cloud systems, in particular, on convective clouds, has been developed in which action is exerted on the clouds by covering the area of ascending air flows with a monolayer of a reagent such as hexadexane. The main disadvantages of this method is the negative impact on the ecology of the environment and the high costs involved due to the need for large quantities of reagent.
In another known method of actively affecting convective clouds, action is exerted by seeding the clouds with the help of airplanes and special small pyrotechnical devices containing 17g of silver iodide mixture (78% of AgJOa by mass) . As a result of this stimulation, the seeded clouds become lighter and grow upwardly to a divergence
region in the upper troposphere. The main disadvantage of this method is that it does not allow for changes in path of the cloud system caused by the artificial changes in its energetics as a result of the exerted action.
In a further known method, the cloud's development stage and direction of movement is determined, action zones are then selected and descending flows are formed or crystallizing reagent is introduced into these action zones.
The disadvantages of these prior art methods is that the action zones used therein do not make it possible to effectively control the process of unstable energy release. Furthermore, it does not provide for the possibility of simultaneously applying to one cloud two different types of action, i.e. the formation of descending flows and the introduction of a crystallizing reagent.
The problem to be solved by the present invention is to increase the efficiency of the positive action carried out on a cloud by controlling the process of unstable energy release.
According to the present invention, there is provided a method of actively affecting a convective cloud, comprising the steps of determining the development stage
of the cloud and its direction of movement, selecting action zones in said cloud, forming descending air flows or introducing a crystallizing reagent into said action zones, the action zones being chosen to be at the front and back parts of the cloud, two points then being selected on opposite sides of the point of deceleration of the tangential component of cloud rotation as viewed from the front and back parts thereof at a distance of 1 to 10km from the first visible side boundary of the cloud and the point of maximum value of the tangential component of cloud rotation and at a distance of 1 to 10km from the second visible side boundary of the cloud, ascending or descending air flows being formed simultaneously or successively in two, three or four of said action zones.
The following additional operations can be used on a convective cloud depending on specific meteorological conditions required: a) descending flows can be formed at the point situated on the back side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and at the point of maximum value of the tangential component of cloud rotation; b) descending flows can be formed at the point situated on the front side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and at the Ooint of maximum value of the
tangential component of cloud rotation; c) descending flows can be formed at the point on the back side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the front part of the cloud; d) descending flows can be formed at the point situated on the back side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and at the point of maximum value of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the front part of the cloud; e) descending flows can be formed at the point of maximum value of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the front part of the cloud; f) descending flows can be formed at the point situated on the front side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the front part of the cloud; g) descending flows can be formed at the point situated on the front side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and at the point of maximum value of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the front part
of the cloud; h) descending flows can be formed at the point situated on the back side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the back part of the cloud; i) descending flows can be formed at the point situated on the back side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and at the point of maximum value of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the back part of the cloud; j) descending flows can be formed at the point situated on the front side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and at the point of maximum value of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the back part of the cloud; k) descending flows can be formed at the point situated on the front side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the back part of the cloud;
1) descending flows can be formed at the point of maximum value of the tangential component of cloud rotation, while a crystallizing reagent is introduced
into the back part of the cloud; m) descending flows can be formed at the point situated on the back side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the front and back parts of the cloud; n) descending flows can be formed at the point situated on the back side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and at the point of maximum value of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the front and back parts of the cloud; o) descending flows can be formed at the point situated on the front side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and at the point of maximum value of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the front and back parts of the cloud; p) descending flows can be formed at the point situated on the front side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the front part of the cloud; q) descending flows can be formed at the point of maximum values of the tangential component of cloud rotation, while a crystallizing reagent is introduced
into the front and back parts of the cloud.
Preferred methods of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:
FIGURE 1 shows a kinematic scheme "vortex-external wind" in which the location of deceleration point A is shown at various stages in the clouds development. A development stage of the cloud is determined by the relationship between the vectors of the external wind and the tangential rotation component. Modules of these vectors are determined by potentials of action forces: non- uniformity of pressure and temperature fields, humidity and orographic obstacles.
The tangential component of vortex rotation is conditioned by the unstable energy release in the air mass and is related to the vertical component by the continuity equation. Acting on the convective component brings about a change in the horizontal component and, hence, the tangential rotation component, which will also change the location of deceleration or friction point A.
FIGURE 2 is a schematic drawing of a cloud where action zones are indicated in which descending air flows are used in the action zones. Also indicated are zones for introducing various reagents capable of causing the
crystallization of water drops in the cloud.
FIGURE 3 shows the results of experiments on the action on convective clouds in order to regulate the intensity of rainfall therefrom. It can be seen from an analysis of the results by comparing the data on rainfall intensity and introducing a crystallizing reagent into the front and back parts of a cloud that a success rate of 0.999 can be achieved. To evaluate statistical data, Fisher-Student criterion of difference validation and ilconson non-parametric criterion were used.
Table 1 shows the results of experiments carried out on the stratification of cumulonimbus clouds.
Table 2 shows the results of action carried out on a dynamic "ambient wind" system undertaken to artificially change the development stage of the cloud, taking into account changes in the path of the cloud after said action.
The method of the invention uses the known principle of regularly governing the movement of a vortex formation in the atmosphere which was first experimentally established using a convective cloud as the example (see Vasilyev S.L.-On the circulation within the zone of a convective cloud. Trudy GGO. vyp. 469, Gidrometeoizdat, 1983, p.p. 107-13) . This principle established that "a vortex
- in ¬ formation in the atmosphere moves relative to the point of deceleration of the tangential rotation component at its highest value; the velocity and rotation component at its highest value; the velocity and direction of movement regularly vary depending on potentials of forces which affect the dynamic "vortex-external wind" system".
The method of the present invention which involves controlling over the process of unstable energy release and related weather phenomena, with changes in the cloud movement vector after the action taken into account, the following procedure for performing the required technological operations is proposed.
The velocity and direction of cloud movement are determined from data obtained by measuring (e.g. with the help of Doppler radar) the wind field in a convective cloud or during successive flights of airplanes above the cloud top, using navigation instruments, or by visually observing the movement of the cloud shadow across the terrain below it relative to fixed reference points. The positions of the action zones can then be determined in the front and back parts of the cloud, two points situated to the left of the cloud on the opposite sides as viewed from the point of deceleration of the tangential component of cloud rotation on the front and back sides, respectively, at a distance of 1 to 10km from the first visible side boundary of the cloud. If the
cloud is developing in the vicinity of a ground target, it is possible to carry out any one of the following seventeen possible action sequences.
1) By forming descending air flows (self-developing descending air flows) at the point situated on the back side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and simultaneously (or successively) at the point of maximum value of the tangential component of cloud rotation, it is possible to increase rainfall intensity, deflect the movement of the cloud in the direction of its rotation through an angle of up to 20% relative to the movement direction, and slow down the movement of the cloud.
2) By forming descending air flows at the point situated on the front side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and simultaneously (or successively) at the point of maximum value of the tangential component of cloud rotation, it is possible to reduce rainfall intensity, deflect the movement of the cloud in a direction opposite to that of rotation through an angle of up to 90° with further transition of the cloud to a loop-like path, and significantly slow down the movement of the cloud.
3! By forming descending air flows at the point
situated on the back side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and simultaneously (or successively) introducing a crystallizing reagent (in order to regenerate convective clouds) in the front part of the cloud, it is possible to significantly increase rainfall intensity, deflect movement of the cloud in the direction of its rotation, i.e. to the left (in the event of the counter-clockwise rotation) , through angle of up to 90° relative to the movement direction, and significantly speed up the movement of the cloud.
4) By forming descending air flows at the point situated on the back side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and simultaneously (or successively) at the point of maximum value of the tangential component of cloud rotation, and simultaneously (or successively) introducing a crystallizing reagent in the front part of the cloud, it is possible to significantly increase rainfall intensity, deflect the movement of the cloud in the direction of its rotation, i.e. to the left (in the event of the counter-clockwise rotation) , through an angle of up to 90° relative to the movement direction, and slow down the movement of the cloud.
5) By forming descending flows at the point of maximum values of the tangential component of cloud rotation and
simultaneously (or successively) introducing a crystallizing reagent in the front part of the cloud, it is possible to significantly increase rainfall intensity, deflect the movement of the cloud in the direction of its rotation, i.e. to the left (in the event of the counter¬ clockwise rotation) , through an angle of up to 90° relative to the movement direction, and significantly slow down the movement of the cloud.
€) By forming descending air flows at the point situated on the front side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and simultaneously (or successively) introducing a crystallizing reagent in the front part of the cloud, it is possible to increase rainfall intensity, deflect the movement of the cloud in a direction opposite to its rotation, i.e. to the right (in the event of the counter-clockwise rotation) , through an angle of up to 45° relative to the movement direction, and slow down the movement of the cloud.
7) By forming descending flows at the point situated on the front side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and simultaneously (or successively) at the point of maximum value of the tangential component of cloud rotation and simultaneously (or successively) introducing a crystallizing reagent in the front part of
the cloud, it is possible to increase rainfall intensity, deflect the movement of the cloud in a direction opposite to that of its rotation, i.e. to the right (in the event of the counter-clockwise rotation) , through an angle of up to 90° relative to the movement direction with further transition of the cloud to a loop-like path, and significantly slow down the movement of the cloud.
8) By forming descending air flows at the point situated on the back side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and simultaneously (or successively) introducing a crystallizing reagent in the back part of the cloud, it is possible to reduce rainfall intensity, change the cloud movement direction towards that of its rotation, i.e. to the left (in the event of the counter¬ clockwise rotation) , through an angle of up to 45° relative to the movement direction, and speed up the movement of the cloud.
9) By forming descending air flows at the point situated on the front side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and simultaneously (or successively) at the point of maximum value of the tangential component of cloud rotation and simultaneously (or successively) introducing a crystallizing reagent in the back part of the cloud, it is possible to reduce rainfall intensity,
deflect the movement of the cloud to the left (in the event of the counter-clockwise rotation) through an angle of up to 45° relative to the movement direction, and slow down the movement of the cloud.
10) By forming descending air flows at the point situated on the front side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and simultaneously (or successively) at the point of maximum value of the tangential component of cloud rotation and simultaneously (or successively) introducing a crystallizing reagent in the back part of the cloud, it is possible to significantly reduce rainfall intensity, deflect the movement of the cloud to the right (in the event of the counter-clockwise rotation) through an angle of up to 90° relative to the movement direction with the transition of the cloud to a loop-like path, and significantly slow down the movement of the cloud.
11) By forming descending air flows at the point situated on the front side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and simultaneously (or successively) introducing a crystallizing reagent in the back part of the cloud, it is possible to significantly reduce rainfall intensity, deflect the movement of the cloud to the right (in the event of the counter-clockwise
rotation) through an angle of up to 90° and significantly slow down the movement of the cloud.
12) By forming descending air flows at the point of maximum value of the tangential component of cloud rotation and simultaneously (or successively) introducing a crystallizing reagent into the back part of the cloud, it is possible to significantly reduce rainfall intensity, deflect the movement of the cloud to the right -(in the event of the counter-clockwise rotation) through an angle of up to 90° relative to the movement direction, and significantly slow down the movement of the cloud.
13) By forming descending air flows at the point situated on the back side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and simultaneously (or successively) introducing a crystallizing reagent in the front and back parts of the cloud, it is possible to completely stop the rain-forming process, deflect the movement of the cloud to the left (in the event of the counter-clockwise rotation) through an angle of up to 45° relative to the movement direction, and speed up the movement of the cloud.
14) By forming descending air flows at the point situated on the back side of the cloud as viewed from the point of deceleration of the tangential component of
cloud rotation and simultaneously (or successively) at the point of maximum value of the tangential component of cloud rotation and simultaneously (or successively) introducing a crystallizing reagent in the front and back parts of the cloud, it is possible to completely stop the rain-forming process, deflect the movement of the cloud to the left (in the event of the counter-clockwise rotation) through an angle of up to 45° relative to the original movement direction, and slow down the movement of the cloud.
15) By forming descending air flows at the point situated on the front part of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and simultaneously (or successively) at the point of maximum values of the tangential component of cloud rotation and simultaneously (or successively) introducing a crystallizing reagent in the front and back parts of the cloud, it is possible to completely stop the rain-forming process, deflect the cloud movement to the right (in the event of the counter-clockwise rotation) through an angle of up to 90° relative to the original movement direction with the transition of the cloud to a loop-like path, and significantly slow down the movement of the cloud.
16) By forming descending air flows at the point situated on the front side of the cloud as viewed from
the point of deceleration of the tangential component of cloud rotation and simultaneously (or successively) introducing a crystallizing reagent in the front and back parts of the cloud, it is possible to completely stop the rain-forming process in the cloud, deflect the cloud in a direction opposite to that of its rotation through an angle of up to 90° relative to the original movement direction, and significantly slow down the movement of the cloud.
17) By forming descending air flows at the point of maximum value of the tangential component of cloud rotation and simultaneously (or successively) introducing a crystallizing reagent in the front and back parts of the cloud, it is possible to completely stop the precipitation process, deflect the movement of the cloud to the right (in the event of the counter-clockwise rotation) through an angle of up to 30° relative to the original movement direction, and to significantly slow down the movement of the cloud.
The above steps are for acting upon individual convective clouds. If it is necessary to control large cloud systems, various combinations of the above steps should be used, for example:
a) by acting on a bank of convective clouds and making them deflect to the left (in the event of the counter-
clockwise rotation) and follow a loop-like path, the involution of the cloud bank into a Meso scale vorticity, i.e. a cluster (the initial stage of the cyclogenesis) , is caused step by step, beginning with the mother cloud, thus, locally reinforcing the cyclogenetic process; b) while acting on a mass of developed convective clouds, a crystallizing reagent is introduced in the front and back parts of the cloud, then the separation of anvils with their further spreading is caused, thereby creating a layer of upper air clouds which hampers the development of convection and, thus, obstructs the cyclogenetic process.
The regeneration of convective clouds is caused by introducing into them small amounts of a crystallizing reagent such as silver iodide, low-temperature plasma, etc. or a coolant like dry ice, liquid nitrogen, etc. A reagent is introduced into the cloud top on its front side. The action is exerted with time intervals equal to or longer than the period of regeneration of convective flows determined by timing the change in the altitude of the upper boundary of clouds or with the help of radar. A brightly outlined top of the cloud which is growing in height (as visually observed from an airplane) is an indication that regeneration has begun. The appearance of fibrous, vertically oriented structures on the cloud top (as seen from an airplane) may serve as an indication of the place and time for introducing the reagen . The
airplane should fly directly above the cloud top but 500- 600m higher than its upper boundary in order to avoid any negative effect due to the dynamic impact its of wake. The heat of phase transitions (condensation and crystallization) released as a result of the active intervention reinforces convective flows due to a growing buoyance of water vapor in the cloud.
Descending air flows (self-developing descending air movements) are formed by dropping into the action zone self-opening 20-30kg wrappers which contain a course- dispersed powder of no less than 103m2/g specific surface. While falling, the course-dispersed powder particles cause the development of descending air movements which condition the dissipation of the kinetic energy of the convective flows. Self-developing descending air flows can also be formed with the help of a helicopter's main rotor or an airplane's wake. The action is repeated with time intervals equal to or shorter than the period of regeneration of convective flows in clouds (15 to 20 minutes) .
The method of the invention has to be carried out over the territory to be protected under conditions of a developing convective cloud and in accordance with the result to be achieved.
The technical and economic efficiency of the method of
the invention lies with the fact that it not only prevents dangerous and extremely dangerous climatic phenomena associated with the development of convective clouds, but also exercises active control (on a Meso scale) over the unstable energy release (cyclogenesis) process. The economic effect provided by the method of the invention can be measured in terms of the damage prevented as a result of using it.
TABLE 1
Spatial and time responses of treated clouds
Type of n H m.u.b H m.l.b H m.s T m.s clouds (m) (m) (m) (min)
Cb, 17 8150 2360 3870 13 min Cbinc 48s
Cb, 7 7300 1170 4120 11 min Cbinc 08s
n - number of experiments; H m.u.b - medium altitude of the upper boundary of clouds prior to the action;
H m.l.b - medium altitude of the lower boundary of clouds prior to the action;
H m.s - medium altitude of separation of clouds after the action;
T m.s - medium time interval of cloud separation after the action.
TABLE 2
Nos Hub Hlb V Vc U o r degr km km km/ km/ degr km time h h km/h
1 7.0 0.6 360° 10° 5.0 -10° 80 50 km/ km/h h
13.53 8.5 1.0 35° 14.22 7.4 50 km/h -35°
2 7.0 0.6 30° 48° 120° 4.5 50 39 25
13.50 8.2 km/ km/ km/h h h
14.59 6.0 -72°
3 9.2 0.8 48° 70 3.5 -22° 39 30 km/ km/h h
15.48 8.7 1.2 60° - -12°
16.08 7.8 1.0 25- 30 -2°
17.23 50°
40km
/h
H ub - altitude of upper boundary; H lb - altitude of lower boundary; mean value of wind at given altitude; Vc
- mean value of wind in ac convection layer ( W/ Z>0) ; Uc
- vector of cloud movement velocity; "radius" of Uo deviation from Vc, (+) - to the left, (-) - to the right Data on wind and cloud movement are navigational (from a compass)
Claims
1. A method of acting on convective clouds, comprising the steps of determining the development stage of a cloud and its direction of movement, selecting action zones therein and, forming descending air flows or introducing a crystallizing reagent into said action zones, characterised in that the action zones are chosen to be at the front and back parts of the cloud, two points then being selected which are situated on opposite sides of the point of deceleration of the tangential component of cloud rotation as viewed from the front and back parts, respectively, at a distance of 1 to 10km from the first visible side boundary of the cloud and the point of maximum value of the tangential component of cloud rotation and at a distance of 1 to 10km from the second visible side boundary of the cloud, ascending or descending air flows being formed simultaneously or successively in two, three or four of said action zones.
2. A method according to claim 1 characterised in that the descending air flows are formed at the point situated on the back side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and at the point of maximum value of the tangential component of the cloud rotation.
3. A method according to claim 1 characterised in that the descending air flows are formed at the point situated on the front side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and at the point of maximum value of the tangential component of cloud rotation.
4. A method according to claim 1 characterised in that the descending air flows are formed at the point situated on the back side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the front part of the cloud.
5. A method according to claim 1 characterised in that the descending air flows are formed at the point situated on the back side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and at the point of maximum value of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the front part of the cloud.
6. A method according to claim 1 characterised in that the descending air flows are formed at the point of maximum value of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the front part of the cloud.
7. A method according to ciaim 1 characterised in that the descending air flows are formed at the point situated on the front side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the front part of the cloud.
8. A method according to claim 1 characterised in that the descending air flows are formed at the point situated on the front side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and at the point of maximum value of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the front part of the cloud.
9. A method according to claim 1 characterised in that the descending air flows are formed at the point situated on the back side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the back part of the cloud.
10. A method according to claim 1 characterised in that the descending air flows are formed at the point situated on the back side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and at the point of maximum value of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the back part of the cloud.
11. A method according to claim 1 characterised in that the descending air flows are formed at the point situated on the front side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and at the point of maximum value of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the back part of the cloud.
12. A method according to claim 1 characterised in that the descending air flows are formed at the point situated on the front side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the back part of the cloud.
13. A method according to claim 1 characterised in that the descending air flows are formed at the point of maximum value of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the back part of the cloud.
14. A method according to claim 1 characterised in that the descending air flows are formed at the point situated on the back side of the cloud as viewed from the ooint of deceleration of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the front and back parts of the cloud.
15. A method according to claim 1 characterised in that the descending air flows are formed at the point situated on the back side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and at the point of maximum value of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the front and back parts of the cloud.
16. A method according to claim 1 characterised in that the descending air flows are formed at the point situated on the front side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation and at the point of maximum value of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the front and back parts of the cloud.
17. A method according to claim 1 characterised in that the descending air flows are formed at the point situated on the front side of the cloud as viewed from the point of deceleration of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the front part of the cloud.
18. A method according to claim 1 characterised in that the descending air flows are formed at the point of maximum value of the tangential component of cloud rotation, while a crystallizing reagent is introduced into the front and back parts of the cloud.
19. A method of acting on convective clouds substantially as herein described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU34788/95A AU3478895A (en) | 1995-06-15 | 1995-09-08 | Method of acting on convective clouds |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| RU95109091 | 1995-06-15 | ||
| RU95109091 | 1995-06-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1997000008A1 true WO1997000008A1 (en) | 1997-01-03 |
Family
ID=20168447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/GB1995/002148 WO1997000008A1 (en) | 1995-06-15 | 1995-09-08 | Method of acting on convective clouds |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU3478895A (en) |
| WO (1) | WO1997000008A1 (en) |
| ZA (1) | ZA959171B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011078658A1 (en) | 2009-12-21 | 2011-06-30 | Pipe-Proteq B.V. | Wellbore pipe protection device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2394979A1 (en) * | 1977-06-21 | 1979-01-19 | Lacroix Tous Artifices E | Seeding clouds to make rain, esp. using a rocket - using silver iodide and a urea compsn. |
| RU1578857C (en) * | 1988-04-25 | 1994-07-30 | Центральная аэрологическая обсерватория | Method of regulating rainfall from convective clouds |
| RU1762439C (en) * | 1990-03-06 | 1994-08-30 | Байсиев Хаджи-Мурат Хасанович | Method for stimulating precipitation from convective clouds |
-
1995
- 1995-09-08 AU AU34788/95A patent/AU3478895A/en not_active Abandoned
- 1995-09-08 WO PCT/GB1995/002148 patent/WO1997000008A1/en active Application Filing
- 1995-10-30 ZA ZA959171A patent/ZA959171B/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2394979A1 (en) * | 1977-06-21 | 1979-01-19 | Lacroix Tous Artifices E | Seeding clouds to make rain, esp. using a rocket - using silver iodide and a urea compsn. |
| RU1578857C (en) * | 1988-04-25 | 1994-07-30 | Центральная аэрологическая обсерватория | Method of regulating rainfall from convective clouds |
| RU1762439C (en) * | 1990-03-06 | 1994-08-30 | Байсиев Хаджи-Мурат Хасанович | Method for stimulating precipitation from convective clouds |
Non-Patent Citations (3)
| Title |
|---|
| DATABASE WPI Week 9514, Derwent World Patents Index; AN 95-104578 [14] * |
| DATABASE WPI Week 9516, Derwent World Patents Index; AN 95-121490 [16] * |
| ZIMIN ET AL.: "Precipitation enhancement from convective clouds in the tropical zone and plain areas of the European USSR", SOVIET METEOROLOGY AND HYDROLOGY, no. 3, US, pages 31 - 37, XP000563407 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011078658A1 (en) | 2009-12-21 | 2011-06-30 | Pipe-Proteq B.V. | Wellbore pipe protection device |
Also Published As
| Publication number | Publication date |
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| ZA959171B (en) | 1997-04-30 |
| AU3478895A (en) | 1997-01-15 |
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