Longitudinal variation of critical frequencies in polar F-region

Based on data from a network of ionospheric stations located in the range of geographic longitudes 19°–285° and invariant latitudes 53°–70°N we have investigated diurnal behaviour variations in F2-layer critical frequencies for different seasons and different levels of solar activity. The study reve...

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Bibliographic Details
Published in:Advances in space research 2001-01, Vol.27 (8), p.1395-1398
Main Authors: Pirog, O.M., Polekh, N.M., Chistyakova, L.V.
Format: Article
Language:English
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Summary:Based on data from a network of ionospheric stations located in the range of geographic longitudes 19°–285° and invariant latitudes 53°–70°N we have investigated diurnal behaviour variations in F2-layer critical frequencies for different seasons and different levels of solar activity. The study revealed that the longitudinal effect in diurnal f oF2 variations is most conspicuous in the summertime at the invariant latitude about 55–57°N and manifests itself in the shift of the f oF2 maximum into the evening and night-time hours on the Yakutsk (129.6°) and Ottawa (284°) meridians in the region of westward declination. It is likely that such a behaviour of f oF2 is conditioned by a change in the dynamic regime of the high-latitude ionosphere associated with the magnetic anomaly.
ISSN:0273-1177
1879-1948
DOI:10.1016/S0273-1177(01)00038-2