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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, 1496–1505, 1996
https://doi.org/10.1007/s00585-996-1496-2
© European Geosciences Union 1996

Special issue: VIIIe EISCAT

Ann. Geophys., 14, 1496–1505, 1996
https://doi.org/10.1007/s00585-996-1496-2
© European Geosciences Union 1996

  31 Dec 1996

31 Dec 1996

Ionospheric composition measurement by EISCAT using a global fit procedure

B. Cabrit and W. Kofman B. Cabrit and W. Kofman
  • CEPHAG ENSIEG, URA 346 CNRS, Grenoble, France

Abstract. The aim of this paper is to show the gain of the global fit procedure compared to the classical gate-by-gate analysis in the simultaneous determination of the temperatures and composition profiles in the lower F region. A method for the evaluation of the transition altitude and the width of the transition region between molecular and atomic ions is described in the case of the EISCAT CP1 experiment; it is validated using a simulated experiment. It is shown that alternating-code gates have to be processed together with the long-pulse gates. Our new method is applied on six days of actual data. The results obtained during quiet periods are compared with independent estimations.

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