Physics
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985p%26ss...33..591s&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 33, June 1985, p. 591-596.
Physics
18
Auroral Zones, Electrostatic Waves, Plasma Turbulence, Space Plasmas, Atmospheric Models, Earth Magnetosphere, Electron Precipitation, Kinetic Equations, Particle Acceleration, Turbulence Effects
Scientific paper
The arbitrary low-frequency electrostatic turbulence in a quasi-static parallel electric field is studied theoretically within the framework of Stasiewicz's (1984) quasi-linear approximation. A generalized quasi-linear kinetic equation is derived to describe the effect of the turbulent region on the flux of precipitating magnetospheric electrons. A runaway velocity v sub r is introduced, at which a balance is attained between the electric field acceleration and electron momentum loss due to plasma waves. It is shown that the electron population in the turbulent region can be divided into two parts: electrons with velocities less than v sub r and electrons with velocities greater than v sub r which may pass through the turbulent region unimpeded by plasma waves, thus contributing to the magnetospheric electron flux observed at ionospheric altitudes. Analytical expressions are derived for the particle energies and energy fluxes implied by the quasi-linear approximation. The analytical expressions are found to agree well with empirical relations between electron fluxes and peak energy in inverted-V electron spectra.
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