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| Titel |
Magnetic field of the transition current system: dawn-dusk asymmetry |
| VerfasserIn |
E. S. Belenkaya, I. I. Alexeev, C. R. Clauer |
| 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. 8 ; Nr. 25, no. 8 (2007-08-29), S.1899-1911 |
| Datensatznummer |
250015905
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| Publikation (Nr.) |
 copernicus.org/angeo-25-1899-2007.pdf |
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| Zusammenfassung |
| In this paper we consider the interactions of coronal mass ejections (CMEs)
with the Earth's magnetosphere for the specific case in which there is a sharp
increase in the dynamic pressure (interplanetary shock) that is associated with
a simultaneous northward turning of the interplanetary magnetic field (IMF) from
the near horizontal direction. Previously, we have shown that under such
circumstances, the so-called transition current systems arise. These temporary
high-latitude current systems create a low-latitude asymmetric magnetic field on
the ground with a large northward field enhancement on the nightside and
little or no field increase near local noon. Here we investigate the dawn-dusk
asymmetry of the low-latitude on-ground magnetic field of the transition
current system caused by the IMF. Analysis of the Region 1 current circuit for
northward IMF shows a change in its shape controlled by different IMF
components. Due to this geometrical effect, the maximum and minimum magnetic
field disturbances appear to be shifted. The obtained results supplement and define
more precisely the locations of the magnetic disturbance extrema retrieved
recently by Clauer et al. (2001). The results of this study are compared with
the available observations. A good accordance is demonstrated. |
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