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Ann. Geophys., 14, 1496-1505, 1996
www.ann-geophys.net/14/1496/1996/
© European Geosciences Union 1996
Ionospheric composition measurement by EISCAT using a global fit procedure
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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