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| Titel |
Post-noon two-minute period pulsating aurora and their relationship to the dayside convection pattern |
| VerfasserIn |
S. E. Milan, T. K. Yeoman, Mark Lester, J. Moen, P. E. Sandholt |
| 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 ; 17, no. 7 ; Nr. 17, no. 7, S.877-891 |
| Datensatznummer |
250013784
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| Publikation (Nr.) |
 copernicus.org/angeo-17-877-1999.pdf |
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| Zusammenfassung |
Poleward-moving auroral forms, as observed by
meridian-scanning photometers, in the vicinity of the cusp region are generally
assumed to be the optical signature of flux transfer events. Another class of
quasi-continuous, short period (1-2 min) wave-like auroral emission has been
identified, closely co-located with the convection reversal boundary in the
post-noon sector, which is similar in appearance to such cusp aurora. It is
suggested that these short period wave-like auroral emissions, the optical
signature of boundary plasma sheet precipitation in the region 1 field-aligned
current system, are associated with ULF magnetohydrodynamic wave activity, which
is observed simultaneously by ground magnetometer stations. This association
with ULF wave activity is strengthened by the observation of several harmonic
frequencies in the pulsation spectrum, each an overtone of the fundamental
standing wave resonance frequency.
Key words. Magnetospheric physics (auroral phenomena;
magnetopause · cusp · and boundary layers; MHD waves and instabilities) |
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