Effects of ion collisions on quasi-linear heating by the current-driven ion cyclotron instability in the high-latitude ionosphere

Details Effects of ion collisions on quasi-linear heating by the current-driven ion cyclotron instability in the high-latitude ionosphere Effects of ion collisions on quasi-linear heating by the current-driven ion cyclotron instability in the high-latitude ionosphere

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.5510s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, May 1, 1989, p. 5510-5514. Research supported by the U.S. Navy.

Physics

4

Atmospheric Heating, F Region, Ion Cyclotron Radiation, Ionic Collisions, Ionospheric Heating, Polar Regions, Collisional Plasmas, Electron Energy, Field Aligned Currents, Ion Currents

Scientific paper

Using an effective relaxation time model, the effects of ion-ion and ion-neutral collisions on quasi-linear ion heating by the current-driven ion cyclotron instability in the high-latitude ionosphere is studied. For conditions typical of the high-latitude lower (200-300 km) F region ionosphere, it is found that the combined effects of ion-neutral and ion-ion collisions tend to isotropize the perpendicular and parallel ion temperature components on time scales of the order of several tens to hundreds of NO+ cyclotron periods for wave amplitudes e x phi/Te = 0.2, where phi is the wave electrostatic potential, Te the electron temperature, and e the electron charge. For the high-latitude upper (600 km) F region ionosphere it is found that stronger anisotropy can be sustained even in the presence of ion collisions by waves with amplitudes e x phi/Te = 0.2. For larger-amplitude waves e x phi/Te = 0.4, the heating is weakly anisotropic at low altitudes (200-300 km) and strongly anisotropic at higher (600 km) altitudes.

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