Heating of ions to superthermal energies in the topside ionosphere by electrostatic ion cyclotron waves

Details Heating of ions to superthermal energies in the topside ionosphere by electrostatic ion cyclotron waves Heating of ions to superthermal energies in the topside ionosphere by electrostatic ion cyclotron waves

Aug 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.4289u&link_type=abstract

Journal of Geophysical Research, vol. 84, Aug. 1, 1979, p. 4289-4296.

Physics

23

Ion Motion, Ionic Waves, Ionospheric Heating, Ionospheric Ion Density, Isis Satellites, Thermal Energy, Auroral Zones, Electromagnetic Radiation, Electrostatic Waves, Geomagnetism, Ion Cyclotron Radiation, Magnetic Moments, Particle Flux Density, Pitch (Inclination), Spectrometers

Scientific paper

The soft particle spectrometer on the Isis 2 spacecraft occasionally observes fluxes of ions moving upward out of the ionosphere in the vicinity of the auroral oval. These ion fluxes are characterized by a sharp pitch angle distribution usually peaked at an angle somewhat greater than 90 deg, indicative of particles heated to a large transverse temperature in a narrow range below the spacecraft. The observations are interpreted in terms of electrostatic ion cyclotron waves, which heat the ions to superthermal energies transverse to the earth's magnetic field. When the transverse energy increases, the repulsive force of the earth's magnetic field, proportional to the particle magnetic moment, repels the particles away from the earth.

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