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| Titel |
Letter to the EditorA statistical study of the location and motion of the HF radar cusp |
| VerfasserIn |
T. K. Yeoman, P. G. Hanlon, K. A. McWilliams |
| 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 ; 20, no. 2 ; Nr. 20, no. 2, S.275-280 |
| Datensatznummer |
250014362
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| Publikation (Nr.) |
 copernicus.org/angeo-20-275-2002.pdf |
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| Zusammenfassung |
The large-scale and
continuous monitoring of the ionospheric cusp region offered by HF radars has
been exploited in order to examine the statistical location and motion of the
equatorward edge of the HF radar cusp as a function of the upstream IMF BZ
component. Although a considerable scatter is seen, both parameters have a
clear influence from the north-south component of the IMF. Excellent agreement
is achieved with previous observations from low altitude spacecraft data. The
HF radar cusp region is seen to migrate equatorward at a rate of 0.02° min-1
nT-1 under IMF BZ south conditions, but remains
static for IMF BZ north. The motion of the cusp implies an
addition of magnetic flux of ~ 2 × 104 Wbs-1 nT-1
under IMF BZ south conditions, equivalent to a reconnection
voltage of 20 kV nT-1, which is consistent with previous estimates
from case studies on both the dayside and nightside regions.
Key words. Ionosphere (auroral
ionosphere) – Magnetospheric physics (magnetosphere-ionosphere interaction;
solar wind magnetosphere interactions) |
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