Long-term changes in the relation between foF2 and hmF2


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The change in the dependence of the F2-layer critical frequency on its height hmF2 is considered based on two sources of initial data used earlier by the authors. It is found that the slope k of the foF2 dependence on hmF2 systematically decreases from the earlier (“etalon”) period, 1958–1980, to the later periods of 1988–2010, 1998–2010, and 1998–2014. Since the foF2 value depends on the atomic oxygen concentration in the F region much more strongly than hmF2, the found decrease in k confirms the concept of a decrease in the atomic oxygen concentration in the thermosphere with time previously formulated by the authors.

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A. Danilov

Institute of Applied Geophysics

编辑信件的主要联系方式.
Email: adanilov99@mail.ru
俄罗斯联邦, Moscow, 129128

A. Konstantinova

Institute of Applied Geophysics

Email: adanilov99@mail.ru
俄罗斯联邦, Moscow, 129128

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