The peculiarities of the manifestation of long-time oscillations in variations of critical frequency of an ionosphere F2-layer

Details The peculiarities of the manifestation of long-time oscillations in variations of critical frequency of an ionosphere F2-layer The peculiarities of the manifestation of long-time oscillations in variations of critical frequency of an ionosphere F2-layer

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008spie.6936e..64v&link_type=abstract

Fourteenth International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics. Edited by Matvienko, Gennadii G.; Banak

Physics

Optics

Scientific paper

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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