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| Titel |
The ionospheric footprint of antiparallel merging regions on the dayside magnetopause |
| VerfasserIn |
I. J. Coleman, M. Pinnock, A. S. Rodger |
| 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. 5 ; Nr. 18, no. 5, S.511-516 |
| Datensatznummer |
250013984
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| Publikation (Nr.) |
 copernicus.org/angeo-18-511-2000.pdf |
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| Zusammenfassung |
The antiparallel merging hypothesis states
that reconnection takes place on the dayside magnetopause where the solar and
geomagnetic fields are oppositely directed. With this criterion, we have mapped
the predicted merging regions to the ionosphere using the Tsyganenko 96 magnetic
field model, distinguishing between regions of sub-Alfvénic and super-Alfvénic
magnetosheath flow, and identifying the day-night terminator. We present the
resulting shape, width and latitude of the ionospheric dayside merging regions
in both hemispheres, showing their dependence on the Earth's dipole tilt. The
resulting seasonal variation of the longitudinal width is consistent with the
conjugate electric fields in the northern and southern cusps, as measured by the
SuperDARN HF radars, for example. We also find a seasonal shift in latitude
similar to that observed in satellite cusp data.
Key words: Ionosphere (ionosphere-magnetosphere
interactions) · Magnetospheric physics (magnetopause · cusp and boundary
layers; magnetosphere-ionosphere interactions) |
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