Hannover 2016 – scientific programme

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P: Fachverband Plasmaphysik

P 26: Poster Session-Plasma Diagnostics

P 26.17: Poster

Thursday, March 3, 2016, 16:30–19:00, Empore Lichthof

Diurnal dependence of foF2 variations connected with earthquakes — Elena V. Liperovskaya¹, •Claudia-Veronika Meister², Dieter H.H. Hoffmann², and Alexandra S. Silina¹ — ¹Institute of Physics of the Earth, Bol’shaya Gruzinskaya 10, 123995 Moscow — ²Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstr. 9, 64289 Darmstadt, and Graduate School of Excellence Energy Science and Engineering, Jovanka-Bontschits-Str. 2, 64287 Darmstadt

The diurnal variation of the characteristic frequency foF2 of the ionosphere is studied with regard to earthquakes. Used are observations of the vertical ionospheric sounding station "Tokyo" registered in the years 1957-1990. Analysed are the normalized parameter Δ foF2_norm = (FoF2−medium(foF2))/medium(foF2) obtained for every hour of the day, and abs(Δ foF2_norm). It is found, that about one-and-a-half months before earthquakes with magnitudes M > 5.5, at distances R > R_D + 100 km, abs(Δ foF2_norm) increases in the evening, where R_D =exp(M) designates the dimension of the earthquake preparation region. The increase depends on M. Studying seismo-ionospheric effects two-three days before earthquakes, it is obtained that at night about two days before the seismic shocks Δ foF2_norm increases with a reliability of 95 % in case of earthquakes with magnitudes M > 5.5 at distances R > R_D + 100 km. Further, a decrease of Δ foF2_norm is observed on the day of the earthquake at daytime, for M > 6.0 and R < 1000 km.