Physical characteristics of noncondensation aerosol clouds

In the clear dry atmosphere an aerosol can accumulate as limited formations resembling ordinary condensation clouds. Such aerosol clusters were named the noncondensation aerosol clouds because the condensation processes are hardly probable under a low relative humidity. The investigation revealed that in the aerosol clouds the middle-size fraction of soil origin primarily contribute to the total number concentration. Horizontal dimensions of such clouds vary between 6 and 35 km. The mean value of horizontal extension is 8 to 20 km that is commensurate with the clouds of vertical development. The altitude at which such formations were observed also be different. It varies between 1.1 and 4.53 km.