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LOCAL TIME DEPENDENCE OF THE IONOSPHERIC RESPONSE TO GEOMAGNETIC DISTURBANCES OVER BULGARIA
Abstract
The dependence of the relative deviation of the critical frequencies of the ionospheric F2- layer (foF2) and the total electron content (TEC) on geomagnetic disturbances was investigated based on data from an ionosonde station at Sofia (National Institute of Geophysics, Geodesy and Geography - Bulgarian Academy of Sciences) for the period of 1995-2014. The local time dependence is presented by a Fourier decomposition including four harmonics of the diurnal course. The average daily dependencies for each calendar month were obtained. The results for the two above mentioned ionospheric characteristics are similar and show that the negative reactions are localized around 6 and 20-21 hours local time. While the negative response around 6 LT is present during the entire year that around 20-21 LT is seen only in summer and equinoxes. In winter during day- and evening-time positive reaction prevails. The seasonal behavior of the amplitudes and phases of the main Fourier components (24- and 12-hour) was presented as well; it reveals that the 24-hour component dominates in the winter months, especially well expressed in the TEC, while the 12-hour one is well seen in the summer months. The presented local time dependence of the ionospheric response on the geomagnetic activity indicates the contribution of the dynamical impact from below. This study presented the seasonal/local time dependence of the geomagnetic response seen in the basic ionospheric characteristics foF2 and TEC over Bulgaria and provided explanations for the results obtained.
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References9
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