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| Titel |
The influence of geomagnetic activity on mesospheric summer echoes in middle and polar latitudes |
| VerfasserIn |
O. Zeller, J. Bremer |
| 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 ; 27, no. 2 ; Nr. 27, no. 2 (2009-02-19), S.831-837 |
| Datensatznummer |
250016417
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| Publikation (Nr.) |
 copernicus.org/angeo-27-831-2009.pdf |
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| Zusammenfassung |
| The dependence of mesospheric VHF radar echoes during
summer months on geomagnetic activity has been investigated with observation
data of the OSWIN radar in Kühlungsborn (54° N) and of the ALWIN
radar in Andenes (69° N). Using daily mean values of VHF radar echoes and
of geomagnetic activity indices in superimposed epoch analyses, the
comparison of both data sets shows in general stronger radar echoes on the
day of the maximum geomagnetic activity, the maximum value one day after the
geomagnetic disturbance, and enhanced radar echoes also on the following 2–3
days. This phenomenon is observed at middle and polar latitudes and can be
explained by precipitating particle fluxes during the ionospheric post storm
effect. At polar latitudes, the radar echoes decrease however during and one
day after very strong geomagnetic disturbances. The possible reason of this
surprising effect is discussed. |
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