Pc3 pulsations during variable IMF conditions

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 simul...

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Bibliographic Details
Published in:Annales Geophysicae
Main Authors: U. Villante, S. Lepidi, P. Francia, M. Vellante, A. Meloni, R. P. Lepping, F. Mariani
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 1999
Subjects:
Science
Q
Physics
QC1-999
Geophysics. Cosmic physics
QC801-809
Terra Nova Bay
Antarc*
Antarctica
Online Access:https://doi.org/10.1007/s00585-999-0490-x
https://doaj.org/article/155887e88d404e2a9b226976a3235335
Description
Summary: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)

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