Vortex motions and transportation of fine disperse dust particles in the ionosphere |
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| Authors: | Besedina Yu N Popel S I Shukla P K |
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| Institution: | (1) University of Newcastle, Australia |
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| Abstract: | Redistribution of dust particles in the ionosphere as a result of vortical motions is discussed. The following possibilities
are studied: capture and evolution of dust particles in acoustic-gravitational (AG) vortices, formation of dust vortices as
a result of involving a great number of dust particles into vortex motions, and formation of vertical dust flows (streamers).
It is shown that excitation of AG-vortices at altitudes of 110–130 km as a result of development of AG-wave instability, associated
with non-zero balance of heat fluxes, owing to solar radiation, water vapors condensation, infrared emission of the atmosphere,
and thermal conductivity, leads to a substantial transportation of dust particles and their mixing at altitudes of 110–120
km. Layers of dust particles in the ionosphere with a thickness of about a kilometer, forming at altitudes less than 120 km,
distribute within the region of existence of AG-vortical structures. As a result, at altitudes of 110–120 km, dust vortices
can appear, and transportation of particles up to altitudes of 130 km becomes possible. One of the ways of transportation
of dust particles in the ionosphere is vertical flows (streamers), which are generated by dust vortices as a result of development
of parametric instability. |
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