Research article
28 Jun 2011
Research article | 28 Jun 2011
Daytime variations of foE connected to earthquakes
E. V. Liperovskaya1, V. V. Bogdanov2, P.-F. Biagi3, C.-V. Meister4, and V. A. Liperovsky1
E. V. Liperovskaya et al.
E. V. Liperovskaya1, V. V. Bogdanov2, P.-F. Biagi3, C.-V. Meister4, and V. A. Liperovsky1
- 1Institute of Physics of the Earth of the Russian Academy of Sciences, Bolshaya Gruzinskaya 10, 123995 Moscow, Russia
- 2Institute of Cosmophysical Research and Radio Wave Propagation, Far Eastern Branch of the Russian Academy of Sciences, 684034 Petropavlovsk-Kamchatsky, Russia
- 3Physics Department, University of Bari, 70126 Bari, Italy
- 4Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstr. 9, 64289 Darmstadt, Germany
- 1Institute of Physics of the Earth of the Russian Academy of Sciences, Bolshaya Gruzinskaya 10, 123995 Moscow, Russia
- 2Institute of Cosmophysical Research and Radio Wave Propagation, Far Eastern Branch of the Russian Academy of Sciences, 684034 Petropavlovsk-Kamchatsky, Russia
- 3Physics Department, University of Bari, 70126 Bari, Italy
- 4Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstr. 9, 64289 Darmstadt, Germany
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Received: 15 Oct 2010 – Revised: 15 Mar 2011 – Accepted: 23 May 2011 – Published: 28 Jun 2011
In the present work it is shown that, in accordance with the observations of the vertical sounding station "Tashkent", the critical foE-frequency of the daytime E-layer increases about one day before winter-earthquakes with magnitudes M > 5 and depths of the epicentre of h < 60 km, which appeared at distances of R < 2000 km from the station. The reliability of the result is larger than 99 %. The phenomenon is not observed for summer-earthquakes. It seems to be determined by the atmospheric wind system. Further, the variations of the foE-frequency are compared with possible simultaneous variations of the critical frequency foF2 of the F2-layer. First results show that only very large changes of the ionisation density in the E-layer influence the ionisation density in the F-region. Therefore, no synchronous growth of the foE- and foF2-frequencies 1–2 days before seismic shocks could be observed.
