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| Titel |
The burst of solar and geomagnetic activity in August-September 2005 |
| VerfasserIn |
A. Papaioannou, H. Mavromichalaki, E. Eroshenko, A. Belov, V. Oleneva |
| 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. 3 ; Nr. 27, no. 3 (2009-03-02), S.1019-1026 |
| Datensatznummer |
250016435
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| Publikation (Nr.) |
 copernicus.org/angeo-27-1019-2009.pdf |
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| Zusammenfassung |
| During the August–September 2005 burst of solar activity, close to the
current solar cycle minimum, a significant number of powerful X-ray flares
were recorded, among which was the outstanding X17.0 flare of 7 September
2005. Within a relatively short period (from 22 August to 17 September) two
severe magnetic storms were also recorded as well as several Forbush
effects. These events are studied in this work, using hourly mean variations
of cosmic ray density and anisotropy, derived from data of the neutron
monitor network. During these Forbush effects the behavior of high energy
cosmic ray characteristics (density and anisotropy) is analyzed together
with interplanetary disturbances and their solar sources, and is compared to
the variations observed in geomagnetic activity. A big and long lasting
(~6 h) cosmic ray pre-decrease (~2%) is defined before
the shock arrival on 15 September 2005. The calculated cosmic ray gradients
for September 2005 are also discussed. |
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