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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 14, issue 12
Ann. Geophys., 14, 1506–1512, 1996
https://doi.org/10.1007/s00585-996-1506-4
© European Geosciences Union 1996

Special issue: VIIIe EISCAT

Ann. Geophys., 14, 1506–1512, 1996
https://doi.org/10.1007/s00585-996-1506-4
© European Geosciences Union 1996

  31 Dec 1996

31 Dec 1996

Current state-of-the-art for the measurement of non-Maxwellian plasma parameters with the EISCAT UHF Facility

D. Hubert1, F. Leblanc1, and P. Gaimard2 D. Hubert et al.
  • 1Departement de Recherche Spatiale, CNRS-URA 264, Observatoire de Paris, 92195 Meudon Cedex, France
  • 2Cephag, Domaine Universitaire, BP 46, 38402 St.-Martin d'Hères, France

Abstract. 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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