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首页> 外文期刊>Journal of geophysical research >First simultaneous observations of F-3 layer and ExB drift in Indian sector and modeling
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First simultaneous observations of F-3 layer and ExB drift in Indian sector and modeling

机译：First simultaneous observations of F-3 layer and ExB drift in Indian sector and modeling

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abstract_textpAlthough the basic mechanism of an additional stratification of the daytime equatorial F region, called the F-3 layer, has been explained, two observational aspects that remain not so clear are its summer-winter differences and simultaneous occurrences on either side of the geomagnetic equator. In this paper, we address these two aspects using simultaneous observations of the F-3 layer and vertical ExB drift velocity made for the first time in an Indian station Gadanki (6.5 degrees N mag. lat) during the low solar activity period 2008-2009, and making model computations using the Sheffield University Plasmasphere Ionosphere Model. The observations confirm the frequent occurrence of the F-3 layer in summer months compared to winter months; the observations also reveal the occasional occurrence of clear and distinct F-3 layer in winter although such a layer is frequent in summer. In addition, a threshold vertical plasma velocity (involving the ExB drift and neutral wind) and its time integrated value are found to be important for the formation of the F-3 layer. The model results qualitatively reproduce the observations; and show that irrespective of season the formation of the F-3 layer is centered on that side of the equator where the equatorward neutral wind reduces the downward field-aligned flow of plasma, and the latitude band of the layer can extend to the opposite hemisphere, especially when the vertical plasma velocity is large./p/abstract_text

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