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http://hdl.handle.net/2122/3932| Authors: | Villante, U.* Lepidi, S.* Francia, P.* Vellante, M.* Meloni, A.* Lepping, R. P.* Mariani, F.* |
Title: | Pc3 pulsations during variable IMF conditions | Journal: | Annales Geophysicae | Series/Report no.: | 4 / 17 (1999) | Publisher: | EGS - Springer-Verlag | Issue Date: | 1999 | Keywords: | Magnetospheric physics MHD waves and instabilities Solar wind-magnetosphere interactions |
Subject Classification: | 01. 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. |
| Appears in Collections: | Article published / in press |
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