TITLE:
On the Diurnal Dependence of fbEs-Variations Due to Earthquakes
AUTHORS:
Elena V. Liperovskaya, Claudia-Veronika Meister, Dieter H. H. Hoffmann, Alexandra S. Silina, Natalia E. Vasil’eva
KEYWORDS:
Earthquake Precursors, Ionosphere, Sporadic E-Layer, Half-Transparency Frequency, Earthquake Preparation Region, Solar Influence on E-Layer, Geomagnetic Influence on E-Layer
JOURNAL NAME:
International Journal of Geosciences,
Vol.6 No.7,
July
17,
2015
ABSTRACT: In the present work, disturbances of the
half-transparency frequency fbEs of
the ionospheric sporadic E-layer
are investigated in connection with earthquakes. The fbEs-frequency is proportional to the
square root of the maximum ionisation density of the sporadic E-layer. In this work, it is shown that in 2/3 of the cases,
two days before a seismic shock with magnitude M > 5.5 and on the day of the shock, an
increase of the fbEs-frequency is
obtained at sunset hours at distances from the epicenter R km. In contrast, before sunrise, the fbEs-value decreases. The data analysed are obtained by the three vertical
ionospheric sounding stations“Kokubunji”, “Yamagawa”,
and “Wakkanai” during some tens of years.