Model predictions of the occurrence of non-Maxwellian plasmas, and analysis of their effects on EISCAT data

Details Model predictions of the occurrence of non-Maxwellian plasmas, and analysis of their effects on EISCAT data Model predictions of the occurrence of non-Maxwellian plasmas, and analysis of their effects on EISCAT data

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jatp...50..487f&link_type=abstract

(EISCAT Scientific Association, International EISCAT Workshop, 3rd, Bad Lauterberg, Federal Republic of Germany, Mar. 23-27, 198

Physics

10

Atmospheric Models, Auroral Zones, Eiscat Radar System (Europe), Ion Temperature, Space Plasmas, Electron Energy, Interplanetary Magnetic Fields, Temperature Distribution, Thermosphere

Scientific paper

The recent identification of non-thermal plasmas using EISCAT data has been made possible by their occurrence during large, short-lived flow bursts. For steady, yet rapid, ion convection the only available signature is the shape of the spectrum, which is unreliable because it is open to distortion by noise and sampling uncertainty and can be mimicked by other phenomena. Nevertheless, spectral shape does give an indication of the presence of non-thermal plasma, and the characteristic shape has been observed for long periods (of the order of an hour or more) in some experiments. To evaluate this type of event properly one needs to compare it to what would be expected theoretically. Predictions have been made using the coupled thermosphere-ionosphere model developed at University College London and the University of Sheffield to show where and when non-Maxwellian plasmas would be expected in the auroral zone. Geometrical and other factors then govern whether these are detectable by radar. The results are applicable to any incoherent scatter radar in this area, but the work presented here concentrates on predictions with regard to experiments on the EISCAT facility.

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