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| Titel |
On the SuperDARN cross polar cap potential saturation effect |
| VerfasserIn |
A. V. Koustov, G. Ya. Khachikjan, R. A. Makarevich, C. Bryant |
| 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 ; 27, no. 10 ; Nr. 27, no. 10 (2009-10-05), S.3755-3764 |
| Datensatznummer |
250016666
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| Publikation (Nr.) |
 copernicus.org/angeo-27-3755-2009.pdf |
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| Zusammenfassung |
| Variation of the cross polar cap potential (CPCP) with the interplanetary
electric field (IEF), the merging electric field EKL, the Polar Cap
North (PCN) magnetic index, and the solar wind-magnetosphere coupling
function EC of Newell et al. (2007) is investigated by considering
convection data collected by the Super Dual Auroral Radar Network
(SuperDARN) in the Northern Hemisphere. Winter and summer observations are
considered separately. All variations considered show close to linear trend
at small values of the parameters and tendency for the saturation at large
values. The threshold values starting from which the non-linearity was
evident were estimated to be IEF*~EKL*~3 mV/m, PCN*~3–4,
and EC*~1.5×104. The data
indicate that saturation starts at larger values of the above parameters and
reaches larger (up to 10 kV) saturation levels during summer. Conclusions
are supported by a limited data set of simultaneous SuperDARN observations
in the Northern (summer) and Southern (winter) Hemispheres. It is argued
that the SuperDARN CPCP saturation levels and the thresholds for the
non-linearity to be seen are affected by the method of the CPCP estimates. |
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