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| Titel |
High-time resolution conjugate SuperDARN radar observations of the dayside convection response to changes in IMF By |
| VerfasserIn |
G. Chisham, M. Pinnock, A. S. Rodger, J.-P. Villain |
| 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. 2 ; Nr. 18, no. 2, S.191-201 |
| Datensatznummer |
250013907
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| Publikation (Nr.) |
 copernicus.org/angeo-18-191-2000.pdf |
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| Zusammenfassung |
We present data from conjugate SuperDARN
radars describing the high-latitude ionosphere's response to changes in the
direction of IMF By during a period of steady IMF Bz
southward and Bx positive. During this interval, the radars
were operating in a special mode which gave high-time resolution data (30 s
sampling period) on three adjacent beams with a full scan every 3 min. The
location of the radars around magnetic local noon at the time of the event
allowed detailed observations of the variations in the ionospheric convection
patterns close to the cusp region as IMF By varied. A
significant time delay was observed in the ionospheric response to the IMF By
changes between the two hemispheres. This is explained as being partially a
consequence of the location of the dominant merging region on the magnetopause,
which is ~8-12RE closer to the northern ionosphere than to
the southern ionosphere (along the magnetic field line) due to the dipole tilt
of the magnetosphere and the orientation of the IMF. This interpretation
supports the anti-parallel merging hypothesis and highlights the importance of
the IMF Bx component in solar wind-magnetosphere coupling.
Key words: Ionosphere (plasma convection) -
Magnetospheric physics (magnetopause, cusp, and boundary layers; solar wind -
magnetosphere interactions) |
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