Destabilization and wave-induced evolution of the magnetospheric plasma clouds

Details Destabilization and wave-induced evolution of the magnetospheric plasma clouds Destabilization and wave-induced evolution of the magnetospheric plasma clouds

Oct 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.3995y&link_type=abstract

Journal of Geophysical Research, vol. 80, Oct. 1, 1975, p. 3995-4003.

Physics

1

Electrostatic Waves, Magnetospheric Instability, Plasma Dynamics, Plasma-Particle Interactions, Atmospheric Models, Destabilization, Distribution Functions, Electron Energy, Magnetospheric Electron Density, Thermal Plasmas

Scientific paper

The triggering and saturation mechanisms of electrostatic waves having frequencies near 1 1/2 times the electron gyrofrequency in the magnetosphere are studied. Also studied is the corresponding evolution of the electron distribution function caused by the wave-particle interaction. The linear instabilities supporting these waves are found to require a cold species of electrons having density between 0.1 per cu cm and 1 per cu cm as well as a warm species whose distribution function has a relatively weak positive slope in the velocity space perpendicular to the background magnetic field. The corresponding unstable wavelengths are short and result in much smaller diffusion coefficients than those derived previously. Such instabilities, when triggered by an enhanced injection of ionospheric cold electrons into the warm plasma clouds, can support wave amplitudes that grow to nonlinear saturation levels much greater than 10 mV/m and as large as a few hundred millivolts per meter. The majority of the observed wave activity (1 to 10 mV/m) can be explained as marginal instabilities maintained by a convection-induced slow increase of the cold electrons in the plasma clouds. The evolution of the waves and plasma is described in a simple physical model for different plasma parameters.

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