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| Titel |
Correlations between SAR arc intensity and solar and geomagnetic activity |
| VerfasserIn |
V. V. Lobzin, A. V. Pavlov |
| 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 ; 17, no. 6 ; Nr. 17, no. 6, S.770-781 |
| Datensatznummer |
250013775
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| Publikation (Nr.) |
 copernicus.org/angeo-17-770-1999.pdf |
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| Zusammenfassung |
We present a study of statistical
relationships between SAR arc intensities acquired by the Pacific Northwest
Laboratory Photometer Network during 1978-1988 and solar and geomagnetic
activity indices Dst, F10.7, and Kp by use of the method of
multiple regression analysis. We found significant correlations between
intensity and all of the indices involved. In the present work we show for the
first time that the partial correlation coefficients depend on the time offset, t,
between the time of SAR arc intensity observations and the onset of the
geomagnetic storm recovery phase, with the largest correlations being observed
when
8 h < t < 16 h. It is also shown that there are
significant differences between partial correlation coefficients calculated for
SAR arcs associated with strong
(Dstmin< -100 nT) and weak (Dstmin>-100
nT) geomagnetic storms. We observe also that the multiple correlation
coefficients for strong storms are much larger than for weak ones. We found that
the variations in the electron temperature, Te, in the SAR arc
region are not mainly produced by variations in the electron density of the
ionosphere but are strongly driven by the additional heating of the electron gas
due to an interaction of the ring current ions and the plasmaspheric electrons.
As a result, variations of Te in the SAR arc region with
characteristic time scales from several minutes to several hours are stipulated
by time variations of ring current parameters.
Key words. Atmospheric composition and structure
(airglow and aurora) · Ionosphere (ionosphere · atmosphere interactions;
ionosphere · magnetosphere interactions) |
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