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14 February 2008 The peculiarities of the manifestation of long-time oscillations in variations of critical frequency of an ionosphere F2-layer
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Proceedings Volume 6936, Fourteenth International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics; 69361S (2008) https://doi.org/10.1117/12.783660
Event: Fourteenth International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics, 2007, Buryatia, Russian Federation
Abstract
On a database of vertical sounding of the ionosphere, received on middle-latitude stations Irkutsk (52.5°N, 103°E), Moscow (55.5°N, 37.3°E), and Boulder (40.0°N, 254.7°E) we investigated features of display of the long-period fluctuations (with the periods of internal atmospheric planetary waves) in variations of critical frequency of a F2-layer for a maximum and a minimum of solar activity. Existence of fluctuations with the periods ~7, ~10, ~16, ~22 and ~27 days has been revealed. Their amplitude and time of existence essentially depend on a level of solar activity, a season and regional features. It is shown, that in a minimum of solar activity fluctuations with the shorter periods (<15 days), and within a maximum - with longer (> 20 days) were more often observed. Fluctuations with the periods ~ 16 days are most on a regular basis shown, in the summer they can be present during two months. It is established, that fluctuations such as planetary waves in Eastern Siberia are observed approximately in 2 times more often, than in Northern America.
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G. V. Vergasova, E. S. Kazimirovsky, and N. M. Polekh "The peculiarities of the manifestation of long-time oscillations in variations of critical frequency of an ionosphere F2-layer", Proc. SPIE 6936, Fourteenth International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics, 69361S (14 February 2008); https://doi.org/10.1117/12.783660
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