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| Titel |
Geotail observations of FTE velocities |
| VerfasserIn |
G. I. Korotova, D. G. Sibeck, T. Rosenberg |
| 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. 1 ; Nr. 27, no. 1 (2009-01-06), S.83-92 |
| Datensatznummer |
250016357
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| Publikation (Nr.) |
 copernicus.org/angeo-27-83-2009.pdf |
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| Zusammenfassung |
| We discuss the plasma velocity signatures expected in
association with flux transfer events (FTEs). Events moving faster than or
opposite the ambient media should generate bipolar inward/outward
(outward/inward) flow perturbations normal to the nominal magnetopause in
the magnetosphere (magnetosheath). Flow perturbations directly upstream and
downstream from the events should be in the direction of event motion. Flows
on the flanks should be in the direction opposite the motion of events
moving at subsonic and subAlfvénic speeds relative to the ambient
plasma. Events moving with the ambient flow should generate no flow
perturbations in the ambient plasma. Alfvén waves propagating parallel
(antiparallel) to the axial magnetic field of FTEs may generate
anticorrelated (correlated) magnetic field and flow perturbations within the
core region of FTEs. We present case studies illustrating many of these
signatures. In the examples considered, Alfvén waves propagate along
event axes away from the inferred reconnection site. A statistical study of
FTEs observed by Geotail over a 3.5-year period reveals that FTEs within the
magnetosphere invariably move faster than the ambient flow, while those in
the magnetosheath move both faster and slower than the ambient flow. |
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