Morphology of the G condition occurrence over Irkutsk |
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Authors: | N.M. Polekh K.G. Ratovsky M.G. Deminov O.E. Kolpakova G.P. Kushnarenko |
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Affiliation: | 1. Institute of Solar-Terrestrial Physics SB RAS, P.O. Box 291, 664033 Irkutsk, Russia;2. IZMIRAN RAS, 142190 Troitsk, Moscow Region, Russia |
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Abstract: | Using Irkutsk digisonde data obtained in 2003–2011, a morphological analysis of the G condition occurrence has been made. The G condition was found to occur during daylight hours in summer; in winter, it is extremely rare, and its appearance is associated with intense magnetic storms. In the years of moderate solar activity, the G condition is most frequently registered at Kp ? 4, in the forenoon. During low solar activity, it can be observed under quiet geomagnetic conditions; in most cases, local time of its appearance shifts to afternoon hours. The highest percentage of the G condition occurrence (7.7–6.4%) was recorded in June and July 2008 when the levels of solar and geomagnetic activity were abnormally low. |
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Keywords: | Critical frequency G condition Ionospheric disturbances Ionosphere&ndash atmosphere interaction |
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