Causes of <Emphasis Type="Italic">NmF</Emphasis>2 longitudinal variations at mid- and subauroral latitudes under summer nighttime conditions |
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| Authors: | A T Karpachev N A Gasilov O A Karpachev |
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| Institution: | 1.Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radiowave Propagation,Russian Academy of Sciences,Troitsk, Moscow oblast,Russia |
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| Abstract: | The main factors controlling NmF2 longitudinal variations at mid- and subauroral latitudes have been studied. The data of the Intercosmos-19 topside sounding,
obtained at high solar activity for summer nighttime conditions, have been used in the analysis. The contributions of the
solar ionization, neutral wind, and temperature and composition of the thermosphere to NmF2 longitudinal variations have been estimated based on ionospheric models. It has been indicated that NmF2 variations in the unsunlit midlatitude ionosphere mainly depends on the residual electron density and its decay under the
action of recombination. At subauroral latitudes under summer nighttime conditions, the ionosphere is partially sunlit, and
ionization by solar radiation mainly contributes to NmF2 longitudinal variations, whereas the effect of the neutral wind is slightly less significant. These results also indicate
how the contribution of different factors to NmF2 longitudinal variations changes at different latitudes. |
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