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| Titel |
Identification of the IMF sector structure in near-real time by ground magnetic data |
| VerfasserIn |
A. S. Janzhura, O. A. Troshichev |
| 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.1491-1500 |
| Datensatznummer |
250017081
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| Publikation (Nr.) |
 copernicus.org/angeo-29-1491-2011.pdf |
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| Zusammenfassung |
| A method is proposed to determine in near-real time the
interplanetary magnetic field (IMF) sector structure (SS) effect on
geomagnetic data from polar cap stations. To separate the SS effect, whose
polarity is invariant within an interval from some days to 2 weeks, from the
disturbed solar wind effects with periodicity from minutes to hours, the
daily median values of geomagnetic H (or D) component are estimated. Then the
median values for 9 days preceding the current day are subjected to 3-days
running averages and the interpolation procedure is applied to these
smoothed averages. Comparisons of the sector structure reconstructed from
the ground magnetic data with the actual variations of the GSM IMF By
component measured onboard the ACE spacecraft in the summer months of 1990
and 2001 demonstrate their good agreement with coefficient of correlation
R=0.96–0.97 for the H-component and R=0.93–0.95 for the D-component. The
proposed simple method makes possible identification of the SS effect in the
same near real-time regime as the derivation of the quiet daily curve and as
level of reference for the polar cap magnetic disturbances in the
calculation of the polar cap magnetic activity PC index. |
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