Observations of nonthermal plasmas at different aspect angles

Details Observations of nonthermal plasmas at different aspect angles Observations of nonthermal plasmas at different aspect angles

Feb 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.1439w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Feb. 1, 1989, p. 1439-1449. Research supported by SERC and Oskari Hut

Physics

16

Auroral Zones, Convection, Eiscat Radar System (Europe), Space Plasmas, Ion Motion, Oxygen Ions, Particle Collisions, Plasma Spectra, Radar Data, Velocity Distribution

Scientific paper

A technique is presented for analyzing incoherent scatter radar data obtained during the presence of very large auroral electric fields which can result in significant distortions from a Maxwellian form of the ion velocity distribution function. The method is applied to EISCAT data which show increases of more than 2 km/s in the auroral zone convection velocities over a wide range of latitudes. When the expressions for the distribution function are extended to include mixed-ion composition, the observed spectra are better fitted and the ion composition may be estimated. Non-Maxwellian analysis of the spectra shows that the spectral shape distortion parameter is significantly higher for the molecular ions than for O(+) ions.

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