27 September 2018 | | ZEROGeoengineering.com | BERYULEV G.P.   Head, Department of Cloud Physics and Weather Modification

Precipitation Enhancement An aircraft cloud seeding by ice­forming or hygroscopic agents is a basis of the technology. The seeding is produced from aircrafts of a types IL­18, AN­12, AN­26, AN30, YaK­40, equipped by the complex of onboard instrumentation for measurement of aeronautical parameters and characteristics of atmosphere and clouds necessary for decision making, fulfillment of seeding and assessment of its result, and also by the seeding means which include devices for dropping pyrotechnic generators of an aerosol of silver iodide (AgI), liquid nitrogen generators of fine­ dispersed ice particles and generator of hygroscopic particles.

• Overseeding, i.e., producing ice crystals inside clouds in concentrations many times those of naturally generated ice, brings about a situation an abrupt increase of the number of simultaneously growing precipitation particles is accompanied by a marked slowdown in their growth and a reduction of their falling speed. This, in turn, leads to noticeable temporary reduction of precipitation.  P. 35

Source: http://www.atmos.uwyo.edu/~vali/pep_2005/beriulev.pdf