Non-thermal plasma observations using EISCAT - Aspect angle dependence

Details Non-thermal plasma observations using EISCAT - Aspect angle dependence Non-thermal plasma observations using EISCAT - Aspect angle dependence

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..957w&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 14, Sept. 1987, p. 957-960.

Physics

30

Auroral Zones, Eiscat Radar System (Europe), Plasma Dynamics, Plasma Temperature, Plasma-Particle Interactions, Space Plasmas, Incoherent Scatter Radar, Ion Distribution, Ion Temperature, Plasma Spectra, Velocity Distribution

Scientific paper

Recent observations with the EISCAT incoherent scatter radar have shown large rises in dayside, auroral plasma velocities (greater than 2 km/s) over a wide range of latitudes and lasting about an hour. These are larger than the neutral thermal speed, and allow, for the first time, observations of a nonthermal plasma over a range of observing angles, revealing a clear angular dependence. The observed ion temperature anisotropy, deduced by assuming a Maxwellian line-of-sight ion velocity distribution, is at least 1.75, which exceeds the theoretical value for a bi-Maxwellian based on a realistic ion-neutral collision model. The aspect angle dependence of the signal spectra also indicates non-Maxwellian plasma.

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