Relative flow of H<sup>+</sup> and O<sup>+</sup> ions in the topside ionosphere at mid-latitudes期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Relative flow of H⁺ and O⁺ ions in the topside ionosphere at mid-latitudes

Authors:	GI Bailey RJ Moffett JA Murphy

Institution:	Department of Applied Mathematics and Computing Science, University of Sheffield, Sheffield S10 2TN, England;Department of Mathematics, University of Aston in Birmingham, Birmingham B4 7ET, England

Abstract:	Theoretical results on the daily variation of O⁺ and H⁺ field-aligned velocities in the topside ionosphere are presented. The results are for an L = 3 magnetic field tube under sunspot minimum conditions at equinox. They come from calculations of time-dependent O⁺ and H⁺ continuity and momentum balance in a magnetic field tube which extends from the lower F2 region to the equatorial plane (Murphy et al., 1976).There are occasions when ion counterstreaming occurs, with the O⁺ velocity upward and H⁺ velocity downward. The conditions causing this counterstreaming are described: the H⁺ layer is descending whilst O⁺ is supplied from below either to increase the O⁺ concentration at fixed heights or to replace O⁺ ions lost by charge exchange with neutral H. It is suggested that the results of observations at Arecibo by Vickrey et al. (1976) of O⁺ and H⁺ concentrations and counterstreaming velocities are significantly affected by $E × B$ drift.

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