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| Titel |
CUTLASS Finland radar observations of the ionospheric signatures of flux transfer events and the resulting plasma flows |
| VerfasserIn |
G. Provan, T. K. Yeoman, S. E. Milan |
| 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 ; 16, no. 11 ; Nr. 16, no. 11, S.1411-1422 |
| Datensatznummer |
250013538
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| Publikation (Nr.) |
 copernicus.org/angeo-16-1411-1998.pdf |
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| Zusammenfassung |
The CUTLASS Finland radar has been run in a
two-beam special scan mode, which offered excellent temporal and spatial
information on the flows in the high-latitude ionosphere. A detailed study of
one day of this data revealed a convection reversal boundary (CRB) in the
CUTLASS field of view (f.o.v) on the dayside, the direction of plasma flow
either side of the boundary being typical of a dawn-cell convection pattern.
Poleward of the CRB a number of pulsed transients are observed, seemingly moving
away from the radar. These transients are identified here as the ionospheric
signature of flux transfer events (FTEs). Equatorward of the CRB continuous
backscatter was observed, believed to be due to the return flow on closed field
lines. The two-beam scan offered a new and innovative opportunity to determine
the size and velocity of the ionospheric signatures associated with flux
transfer events and the related plasma flow pattern. The transient signature was
found to have an azimuthal extent of 1900 ± 900 km and an poleward extent of
∼250 km. The motion of the transient features was in a predominantly westward
azimuthal direction, at a velocity of 7.5 ± 3 km.
Key words. Magnetospheric physics (auroral phenomena;
magnetopause · cusp and boundary layers; magnetosphere - ionosphere
interaction) |
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