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Authors: Villante, U.* 
Lepidi, S.* 
Francia, P.* 
Vellante, M.* 
Meloni, A.* 
Lepping, R. P.* 
Mariani, F.* 
Title: Pc3 pulsations during variable IMF conditions
Issue Date: 1999
Series/Report no.: 4 / 17 (1999)
Keywords: Magnetospheric physics
MHD waves and instabilities
Solar wind-magnetosphere interactions
Subject Classification01. Atmosphere::01.03. Magnetosphere::01.03.99. General or miscellaneous 
01. Atmosphere::01.03. Magnetosphere::01.03.02. Magnetic storms 
01. Atmosphere::01.03. Magnetosphere::01.03.04. Structure and dynamics 
Abstract: 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.
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