Morphological analysis of the winter nighttime ionosphere at mid-latitudes of the Asian region |
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| Authors: | O M Pirog N M Polekh A Yu Belinskaya Z F Dumbrava |
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| Institution: | 1.Institute of Solar-Terrestrial Physics, Siberian Branch,Russian Academy of Sciences,Irkutsk,Russia;2.Altai-Sayan Branch of Geophysical Service, Siberian Branch,Russian Academy of Sciences,Novosibirsk,Russia;3.Institute of Cosmophysic Research and Radiowave Propagation, Far East Branch,Russian Academy of Sciences,Paratunka,Russia |
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| Abstract: | We present a study of peculiarities of the winter nighttime maximum in the critical frequencies f
0
F2 at mid-latitudes of the Asian region. The data of stations located at different longitudes and close latitudes have been
used in the analysis: Novosibirsk (54.8°N, 83.2°E), Irkutsk (52.5°N, 104.0°E), and Khabarovsk (48.5°N, 135.1°E). It has been
found that the nighttime maximum in f
0
F2 is observed after midnight (∼0200–0400 LT) and is a stable feature of the quiet ionosphere from the middle of October to
the middle of March at low solar activity (SA) at all analyzed stations. This interval decreases with increasing SA. The difference
between the maximal and minimal f
0
F2 values in nighttime hours is the largest in December–January, and its amplitude is almost independent of SA. Variations
in the critical frequency of the h
m
F2 layer are inversely related to those in the height of the maximum. We have studied periods when the difference between the
daytime and nighttime values of f
0
F2 is less than 2 MHz. The intervals of observations of such events at different longitudes do not coincide. No dependence
of the winter nighttime maximum amplitude on magnetic activity has been found. |
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