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| Titel |
ap-index solar wind driving function and its semiannual variations |
| VerfasserIn |
A. A. Petrukovich, M. Y. Zakharov |
| 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 ; 25, no. 7 ; Nr. 25, no. 7 (2007-07-30), S.1465-1469 |
| Datensatznummer |
250015870
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| Publikation (Nr.) |
 copernicus.org/angeo-25-1465-2007.pdf |
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| Zusammenfassung |
| Semiannual variation of geomagnetic activity and ap-index in
particular is supposed to consist of heliospheric factor (axial
hypothesis and Russell-McPherron effect) and
magnetospheric/ionospheric factor (equinoctical hypothesis).
In our investigation
we express ap-index as a magnetospheric response function to
solar wind and IMF input. Seasonal variation in ap-index on
average (1963–2003) is ~4 nT and consists of ~2.1–2.3 nT
of magnetospheric/ionospheric part, 0.6–1.3 nT of heliospheric
part (including 0.2–0.3 nT of R-M effect), 0.1–0.4 nT is due to
the non-linear term. 90% confidence range of all estimates is
~0.1–0.25 nT. While autumn/spring magnetospheric response
functions are almost identical, there is substantial difference
between winter and summer functions. The increase of solar wind
input in autumn and spring is also different by a factor of two. |
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