Pc3 pulsations during variable IMF conditions

Autor: U. Villante, S. Lepidi, P. Francia, M. Vellante, A. Meloni, R. P. Lepping, F. Mariani
Jazyk: angličtina
Rok vydání: 1999
Předmět:
Zdroj: Annales Geophysicae, Vol 17, Pp 490-496 (1999)
Druh dokumentu: article
ISSN: 0992-7689
1432-0576
DOI: 10.1007/s00585-999-0490-x
Popis: Pc3 geomagnetic field fluctuations detected at low latitude (L'Aquila, Italy) during the passage of a high velocity solar wind stream, characterized by variable interplanetary magnetic field conditions, are analyzed. Higher frequency resonant fluctuations and lower frequency phenomena are simultaneously observed; the intermittent appearance and the variable frequency of the longer period modes can be well interpreted in terms of the variable IMF elements; moreover their polarization characteristics are consistent with an origin related to external waves propagating in antisunward direction. A comparison with simultaneous observations performed at Terra Nova Bay (Antarctica) provides additional evidence for a clear relationship between the IMF and Pc3 pulsations also at very high latitudes.Key words. Magnetospheric physics (MHD waves and instabilities; solar wind · magnetosphere interactions)
Databáze: Directory of Open Access Journals
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