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| Titel |
Concerning the occurrence pattern of flux transfer events on the dayside magnetopause |
| VerfasserIn |
D. G. Sibeck |
| 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. 2 ; Nr. 27, no. 2 (2009-02-23), S.895-903 |
| Datensatznummer |
250016424
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| Publikation (Nr.) |
 copernicus.org/angeo-27-895-2009.pdf |
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| Zusammenfassung |
| We present an analytical model for the magnetic field perturbations
associated with flux transfer events (FTEs) on the dayside magnetopause as a
function of the shear between the magnetosheath and magnetospheric magnetic
fields and the ratio of their strengths. We assume that the events are
produced by component reconnection along subsolar reconnection lines with
tilts that depend upon the orientation of the interplanetary magnetic field
(IMF), and show that the amplitudes of the perturbations generated during
southward IMF greatly exceed those during northward IMF. As a result, even
if the distributions of magnetic reconnection burst durations/event
dimensions are identical during periods of northward and southward IMF
orientation, events occurring for southward IMF orientations must
predominate in surveys of dayside events. Two factors may restore the
balance between events occurring for northward and southward IMF
orientations on the flanks of the magnetosphere. Events generated on the
dayside magnetopause during periods of southward IMF move poleward, while
those generated during periods of northward IMF slip dawnward or duskward
towards the flanks. Due to differing event and magnetospheric magnetic field
orientations, events that produce weak signatures on the dayside
magnetopause during intervals of northward IMF orientation may produce
strong signatures on the flanks. |
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