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| Titel |
Current state-of-the-art for the measurement of non-Maxwellian plasma parameters with the EISCAT UHF Facility |
| VerfasserIn |
D. Hubert, F. Leblanc, P. Gaimard |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 14, no. 12 ; Nr. 14, no. 12, S.1506-1512 |
| Datensatznummer |
250012516
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| Publikation (Nr.) |
 copernicus.org/angeo-14-1506-1996.pdf |
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| Zusammenfassung |
| New results on the information that can be
extracted from simulated non-Maxwellian incoherent radar spectra are presented.
The cases of a pure ionosphere and of a composite ionosphere typical of a given
altitude of the auroral F region are considered. In the case of a pure
ionosphere of NO+ or O+ ions it has been shown that the
electron temperature and the electron density can be derived from a Maxwellian
analysis of radar spectra measured at aspect angles of 0° or 21° respectively;
the ion temperature and ion temperature anisotropy can be derived from a non-
constraining model such as the 1D Raman fitting of a complementary measurement
made at an aspect angle larger than 0° for the NO+ ions, or at an
aspect angle larger than 21° for the O+ ions. Moreover with such
measurements at large aspect angles, the shape of the velocity ion distribution
functions can simultaneously be inferred. The case of a composite ionosphere of
atomic O+ and molecular NO+ ions is a difficult challenge
which requires simultaneously a complementary measurement of the electron
temperature to provide the ion composition and the electron density from the
incoherent radar spectra at a specific aspect angle of 21°; hence, a model
dependent routine is necessary to derive the ion temperatures and ion
temperature anisotropies. In the case where the electron temperature is not
given, a routine which depends on ion distribution models is required first: the
better the ion distribution models are, the more accurately derived the plasma
parameters will be. In both cases of a composite ionosphere, the 1D Raman
fitting can be used to keep a check on the validity of the results provided by
the ion distribution model dependent routine. |
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