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| Titel |
On the longitudinal extent of magnetopause reconnection pulses |
| VerfasserIn |
M. Lockwood, C. J. Davis |
| 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 ; 14, no. 9 ; Nr. 14, no. 9, S.865-878 |
| Datensatznummer |
250012410
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| Publikation (Nr.) |
 copernicus.org/angeo-14-865-1996.pdf |
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| Zusammenfassung |
| The open magnetosphere model of cusp ion
injection, acceleration and precipitation is used to predict the dispersion
characteristics for fully pulsed magnetic reconnection at a low-latitude
magnetopause X-line. The resulting steps, as would be seen by a satellite moving
meridionally and normal to the ionospheric projection of the X-line, are
compared with those seen by satellites moving longitudinally, along the
open/closed boundary. It is shown that two observed cases can be explained by
similar magnetosheath and reconnection characteristics, and that the major
differences between them are well explained by the different satellite paths
through the events. Both cases were observed in association with poleward-moving
transient events seen by ground-based radar, as also predicted by the theory.
The results show that the reconnection is pulsed but strongly imply it cannot
also be spatially patchy, in the sense of isolated X-lines which independently
are intermittently active. Furthermore they show that the reconnection pulses
responsible for the poleward-moving events and the cusp ion steps, must cover at
least 3 h of magnetic local time, although propagation of the active
reconnection region may mean that it does not extend this far at any one instant
of time. |
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