Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1767616 | Advances in Space Research | 2010 | 12 Pages |
Abstract
Hourly values of the F2-layer peak density, NmF2, measured by 62 ionosonde stations from 1957 to 2008 at middle geomagnetic latitudes of the northern and southern hemispheres are used in a statistical study of the F2-region winter anomaly. We analyze a maximum value, R, of the winter/summer geomagnetically quiet daytime NmF2 ratio over each ionosonde for approximately the same winter and summer solar activity conditions. The conditional probability of an occurrence of R in an interval of R, the most frequent value of R, the mean expected value of R, and the conditional probability to observe the F2-region winter anomaly are calculated and studied for low, moderate, and high solar activity conditions. It is found that northern hemisphere stations show significant cross-correlations of winter anomaly statistics with geomagnetic latitude for moderate and high solar activities.
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Physical Sciences and Engineering
Earth and Planetary Sciences
Space and Planetary Science
Authors
A.V. Pavlov, N.M. Pavlova, S.F. Makarenko,