Physics
Scientific paper
Nov 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.4331w&link_type=abstract
Journal of Geophysical Research, vol. 80, Nov. 1, 1975, p. 4331-4345. U.S. Department of Commerce
Physics
4
Airglow, Electroacoustic Waves, F Region, Ionospheric Heating, Magnetoionics, Diffusion Waves, Particle Interactions, Wave Interaction
Scientific paper
A calculation is made of the acceleration of electrons during ionospheric modification experiments. The electrons are accelerated by Langmuir waves excited unstable by the parametric instability. It is emphasized that accelerations by Langmuir waves mainly take place at the bottom of the heated region, where the Langmuir waves are slowest and, consequently, the wave-particle interactions are strongest. The velocity distribution F of accelerated electrons is determined by a kinetic equation in which the effects of Langmuir wave turbulence are described by a stochastic wave diffusion tensor. Both resonant and resonant broadened wave-particle interactions, as well as the angular distribution of Langmuir waves, are important. The accelerated electrons are lost by convecting out of the modified region of the ionosphere. A steady state ensues when the production of accelerated electrons by turbulent diffusion is balanced by convective loss. The calculated steady state F is almost flat for a velocity range extending from 4 to 8 times the electron thermal speed.
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