The contribution of ion-cyclotron waves to electron heating and SAR-arc excitation near the storm-time plasmapause

Details The contribution of ion-cyclotron waves to electron heating and SAR-arc excitation near the storm-time plasmapause The contribution of ion-cyclotron waves to electron heating and SAR-arc excitation near the storm-time plasmapause

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..417t&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, Feb. 21, 1992, p. 417-420.

Physics

46

Electron Cyclotron Heating, Electron Energy, Ion Cyclotron Radiation, Magnetic Storms, Plasmapause, Red Arcs, Helium Ions, Oxygen Atoms, Plasma Waves, Plasmasphere, Wave Propagation

Scientific paper

The potential role of ion-cyclotron waves in the electron heating process has been studied, using the HOTRAY code. It is demonstrated that ion-cyclotron waves can play an important role in both the energy transfer to plasmaspheric electrons and the subsequent downward heat conduction to SAR arc altitudes. In particular, such waves can experience enhanced path integrated amplification along the steep plasmapause density gradient. The latter tends to keep the wave normal angle small on several successive bounces across the equator, thus allowing cyclotron-resonant amplification leading to a total gain of up to 20 e-foldings. When the wave propagation vector becomes highly oblique, absorption occurs during Landau resonance with thermal plasmaspheric electrons, increasing the electron temperature in the direction parallel to the ambient field and leading directly to heat conduction into ionosphere.

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