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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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Citation: Cabrit, B. and Kofman, W.: Ionospheric composition measurement by EISCAT using a global fit procedure, Ann. Geophys., 14, 1496-1505, 1996.   Bibtex   EndNote   Reference Manager