Planetary statistics of the critical frequency of the ionospheric F
2 region during catastrophic earthquakes |
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| Authors: | A L Dzvonkovskaya V A Kuznetsov N P Sergeenko |
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| Institution: | (1) JSC SPC ScientificResearch Institute of Longe-Range Communications, Pervaya Bukhvostova ul. 12/11, Moscow, 107258, Russia;(2) Institute of Applied Geophysics, Rostokinskaya ul. 9, Moscow, 129128, Russia;(3) Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radiowave Propagation, Russian Academy of Sciences, Troitsk, Moscow oblast, 142190, Russia |
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| Abstract: | The statistics of the relative variations (δfoF2) in the critical frequency of the ionospheric F 2 region during catastrophic earthquakes with magnitude M ≥ 6 at 70 vertical sounding (VS) automatic ionospheric stations (AISs) of the global network is considered. Five-day periods including 70 such situations have been selected for 1981 and 1983–1985. Five sets of 24 foF2 measurements from 3 days before to a day after the earthquake instant are formed for each AIS. The number of AISs, for which the fourth statistical invariant is above the significance level (E ≥ 1), has been analyzed. It has been indicated that the histogram deformation at the set of AISs is substantial a day before earthquakes. |
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