Abstract
The maximal R ratios of the winter-to-summer NmF2 values of each ionosonde are calculated for a specified UT under daytime quiet geomagnetic conditions and at approximately equal levels of solar activity, based on foF2 measurement data of 98 ionosondes at mid- and low geomagnetic latitudes of the Northern and Southern hemispheres for 1957–2009. The P(R > 1) conditional probability of NmF2 winter anomaly observations, as well as the most probable RMP and average <R> of R values are calculated for low, moderate, and high solar activity on the base of foF2 measurements during the periods December 22 ± 30 days and June 21 ± 30 days. Variations in P(R > 1), RMP, and 〈R〉 with latitude and solar activity are analyzed.
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Original Russian Text © A.V. Pavlov, N.M. Pavlova, 2012, published in Geomagnetizm i Aeronomiya, 2012, Vol. 52, No. 3, pp. 356–364.
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Pavlov, A.V., Pavlova, N.M. Variations in statistical parameters of the NmF2 winter anomaly with latitude and solar activity. Geomagn. Aeron. 52, 335–343 (2012). https://doi.org/10.1134/S0016793212030127
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DOI: https://doi.org/10.1134/S0016793212030127