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| Titel |
foF2 seismo-ionospheric effect analysis: actual data and numerical simulations |
| VerfasserIn |
E. V. Liperovskaya, P.-F. Biagi, C.-V. Meister, M. V. Rodkin |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 8, no. 6 ; Nr. 8, no. 6 (2008-12-11), S.1387-1393 |
| Datensatznummer |
250005910
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| Publikation (Nr.) |
 copernicus.org/nhess-8-1387-2008.pdf |
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| Zusammenfassung |
| On the
background of seasonal and helio-geomagnetic disturbances,
disturbances of the ionization density near noon connected to
earthquakes are investigated. The study is performed for some tens of
earthquakes
with magnitudes M>5 and depths h<70 km, which occur at
distances from the vertical sounding stations "Tokyo",
"Akita", and "Yamagawa" not
larger than R=exp(M)+150 km. The analysis is performed using data
registered by the three sounding stations every hour during 30 years.
Especially methods of the statistical analysis are applied to search for
regularities in
the lithospheric-ionospheric links before and after earthquakes.
The growth of the mean ionization density N at the
F-layer electron density maximum Fof2 five-three days before earthquakes, and
the decrease of N
approaching the eruption and during a few days after the earthquake
is investigated in dependence on both the magnitude of the earthquake M and
the ionization density N near the F-layer maximum.
It is found that some days before earthquakes the decrease of the ionization
density ΔN is proportional to the values of M and N. After the
earthquakes, ΔN depends much weaker on the magnitude M, and it is
not
influenced by the ionization density N. The variations of the ionization density
three days before earthquakes do not depend on N and
M (within the same order of approximation). |
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