Behavior of <Emphasis Type="Italic">foF</Emphasis>2 and <Emphasis Type="Italic">hmF</Emphasis>2 after sunset |
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Authors: | A D Danilov L B Vanina-Dart |
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Institution: | 1.Institute of Applied Geophysics,Moscow,Russia;2.Institute for Space Research,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | The time behavior of the foF2 and hmF2 values at the time moment T(ss + 2 h) 2 h after sunset is considered. It is assumed that at this moment, the horizontal winds in the thermosphere in
the strongest way influence hmF2 and, therefore, foF2. It is found that a fairly well pronounced and statistically significant change (trend) is observed for the foF2(ss + 2)/foF2(14) ratio, the sign of the change being different for different stations and even different seasons at the same station.
A similar picture is obtained for the value of hmF2(ss + 2). It is shown that a positive correlation between the trends of these two values is observed. This confirms the initial
concept of the paper that the foF2 and hmF2 trends are caused by long-term trends in the thermospheric dynamics. |
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