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| Titel |
Is there any difference in local time variation in ionospheric F2-layer disturbances between earthquake-induced and Q-disturbance events? |
| VerfasserIn |
T. Xu, Y. L. Hu, F. F. Wang, Z. Chen, J. Wu |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 33, no. 6 ; Nr. 33, no. 6 (2015-06-03), S.687-695 |
| Datensatznummer |
250121206
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| Publikation (Nr.) |
 copernicus.org/angeo-33-687-2015.pdf |
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| Zusammenfassung |
| Ionospheric anomalies before earthquakes have become the
subject of one of the most intensive studies in the area of ionospheric
variation. The ionosphere has a large class of disturbances under quiet
geomagnetic conditions, i.e., quiet time disturbances (Q disturbances).
Hence, the characteristics of seismo-ionospheric anomalies obtained by
statistical analysis should be compared with those of Q-disturbance events.
Using the data of foF2 (F2-layer critical frequency) during the whole interval of 1978–2008
(~3 solar cycles), the local time (LT) variation in Q disturbances
is investigated. The results showed that a well-pronounced nighttime peak
took place for positive disturbances induced by Q-disturbance events, while
positive disturbances related to earthquakes predominately occurred in the
daytime, especially in the afternoon LT sector. This remarkable difference
in local time variation in foF2 between the earthquake-triggered and
Q-disturbance events is of great significance for the identification of
ionospheric precursors. |
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