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| Titel |
Development of substorm bulges during different solar wind structures |
| VerfasserIn |
I. V. Despirak, A. A. Lubchich, A. G. Yahnin, B. V. Kozelov, H. K. Biernat |
| 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. 5 ; Nr. 27, no. 5 (2009-05-04), S.1951-1960 |
| Datensatznummer |
250016513
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| Publikation (Nr.) |
 copernicus.org/angeo-27-1951-2009.pdf |
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| Zusammenfassung |
| Using data from WIND spacecraft, we investigated the
difference in substorm bulge development during different types of solar
wind flow: solar wind recurrent streams (RS), corotating interaction regions
(CIR), magnetic clouds (MC), and the region of interaction of magnetic
clouds with undisturbed solar wind (Sheath). The RS/CIR and MC/Sheath
structures were examined for the periods December 1996–July 1997; January
2000–December 2000; October 2001. All available auroral substorms observed
by the Ultra Violet Imager onboard the Polar spacecraft during these periods
were studied. It is shown that the largest latitudinal and longitudinal
sizes of the auroral bulge expansions are during CIR and Sheath intervals.
We found a difference in auroral bulge parameters for MC- and RS-associated
substorms. In contrast to substorms associated with RS, the latitudinal size
of the auroral bulge during MC is smaller, but longitudinal size is larger.
As consequence, the ratio between longitudinal and latitudinal sizes for
MC-associated substorms is also larger. We suggest that the latter feature
is explained by different configuration of the near-Earth magnetotail during
RS and MC. |
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