Particle and wave observations of low-altitude ionospheric ion acceleration events

Details Particle and wave observations of low-altitude ionospheric ion acceleration events Particle and wave observations of low-altitude ionospheric ion acceleration events

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88..341y&link_type=abstract

Journal of Geophysical Research, vol. 88, Jan. 1, 1983, p. 341-355.

Computer Science

Sound

96

Ionospheric Ion Density, Ionospheric Sounding, Low Altitude, Particle Acceleration, Plasma Diagnostics, Plasma Waves, Auroral Zones, Energy Dissipation, Energy Spectra, Ion Temperature, Ionic Collisions, Magnetic Storms, Plasma Density, Sounding Rockets, Velocity Distribution

Scientific paper

Two sounding rockets were launched into the expansive phases of two auroral substorms and passed through source regions of transversely accelerated ionospheric ions. Energetic ion and electron, wave, and ambient plasma observations were made. The events were observed in the 400-600 km range and resulted in the ion energization of hundreds of electron volts. In the acceleration region the ionospheric ion velocity distribution function in the direction perpendicular to the local magnetic field showed a non-Maxwellian, high-energy tail. Plasma density was lower than theoretical quiescent values. Strong thermal ion drift was observed only in the perpendicular direction. Large-amplitude, low-frequency fluctuations in plasma density were present along with a number of different wave modes. The characteristics of the ion energy spectra agreed with a model of ion cyclotron acceleration and energy loss due to ion-neutral collisions.

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