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| Titel |
Central polar cap convection response to short duration southward Interplanetary Magnetic Field |
| VerfasserIn |
P. T. Jayachandran, J. W. MacDougall |
| 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 ; 18, no. 8 ; Nr. 18, no. 8, S.887-896 |
| Datensatznummer |
250014040
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| Publikation (Nr.) |
 copernicus.org/angeo-18-887-2000.pdf |
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| Zusammenfassung |
Central polar cap convection changes
associated with southward turnings of the Interplanetary Magnetic Field (IMF)
are studied using a chain of Canadian Advanced Digital Ionosondes (CADI) in the
northern polar cap. A study of 32 short duration (~1 h) southward IMF transition
events found a three stage response: (1) initial response to a southward
transition is near simultaneous for the entire polar cap; (2) the peak of the
convection speed (attributed to the maximum merging electric field) propagates
poleward from the ionospheric footprint of the merging region; and (3) if the
change in IMF is rapid enough, then a step in convection appears to start at the
cusp and then propagates antisunward over the polar cap with the velocity of the
maximum convection. On the nightside, a substorm onset is observed at about the
time when the step increase in convection (associated with the rapid transition
of IMF) arrives at the polar cap boundary.
Key words: Ionosphere (plasma convection; polar
ionosphere) - Magnetospheric physics (solar wind - magnetosphere interaction) |
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