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| Titel |
Invariability of relationship between the polar cap magnetic activity and geoeffective interplanetary electric field |
| VerfasserIn |
O. A. Troshichev, N. A. Podorozhkina, A. S. Janzhura |
| 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 ; 29, no. 8 ; Nr. 29, no. 8 (2011-08-31), S.1479-1489 |
| Datensatznummer |
250017080
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| Publikation (Nr.) |
 copernicus.org/angeo-29-1479-2011.pdf |
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| Zusammenfassung |
| The PC (polar cap) index characterizing the solar wind energy input
into the magnetosphere is calculated with use of parameters α, β, and φ,
determining the relationship between the interplanetary electric field
(EKL) and the value of magnetic activity δF in the polar caps. These
parameters were noted as valid for large and small EKL values, and as a result the
suggestion was made (Troshichev et al., 2006) that the parameters should remain invariant
irrespective of solar activity. To verify this suggestion, the independent
sets of calibration parameters α, β, and φ were derived separately for the solar
maximum (1998–2001) and solar minimum (1997, 2007–2009) epochs, with a proper
choice of a quiet daily variation (QDC) as a level of reference for the
polar cap magnetic activity value. The results presented in this paper
demonstrate that parameters α, β, and φ, derived under conditions of solar
maximum and solar minimum, are indeed in general conformity and provide
consistent (within 10 % uncertainty) estimations of the PC index. It means
that relationship between the geoeffective solar wind variations and the
polar cap magnetic activity responding to these variations remains invariant
irrespective of solar activity. The conclusion is made that parameters
α, β, and φ derived in AARI#3 version for complete cycle of solar activity
(1995–2005) can be regarded as forever valid. |
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