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Diurnal variations of the atomic oxygen density and temperature determined from incoherent scatter measurements in the ionospheric F region

1970; American Geophysical Union; Volume: 75; Issue: 25 Linguagem: Inglês

10.1029/ja075i025p04825

2156-2202

P. Bauer, Philippe Waldteufel, D. Alcaydé,

Astro and Planetary Science

Recent studies have shown that exospheric temperatures can be obtained from incoherent scatter experiments. A method proposed by Carru et al. (1967) is extended to yield the atomic oxygen density and a temperature shape parameter. The method involves the determination, by means of a nonlinear regression analysis, of the values of neutral temperature and oxygen density that best reproduce the measured ion temperature profile, given measured profiles of electron density and electron temperature. By this method, it is possible to obtain a continuous daytime variation of the neutral parameters with a relative accuracy of 15–20%. The first results exhibit a definite day-to-night variation of the atomic oxygen density, which is compared to the variation given by the Jacchia and Cira models.