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Thermophysics and Aeromechanics

2003 year, number 2

Photophoresis of aerosols in the Earth atmosphere

S.А. Beresnev, L.B. Kochneva, and P.E. Suetin
Ural State University, Ekaterinburg, Russia
Pages: 287-301


The photophoretic motion of atmospheric aerosol particles in the field of solar radiation and in the field of outgo-ing thermal radiation of the Earth is examined. The problem statement and the technique for computing the basic characteristics of phenomenon are presented. A tentative analysis of the obtained results is conducted. The soot particles as well as other light and low heat conductivity aerosols in the stratosphere are shown to be highly sensitive to the photophoretic effects. In particular, the levitation and even vertical lifting against gravity for soot particles with sizes of about 0.1 0.8 m in the solar radiation field and for particles with sizes of 1 2 m in the thermal radiation field of the Earth are predicted. At the same time, the radiometric photophoresis of particles in the thermal radiation field appears to be no significant mechanism in maintaining a stable existence of known aerosol layers in stratosphere and mesosphere.