Pc3 pulsations during variable IMF conditions |
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| Authors: | U Villante S Lepidi P Francia M Vellante A Meloni R P Lepping F Mariani |
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| Institution: | (1) Dipartimento di Fisica, Università dell’Aquila, L’Aquila, Italy;(2) Istituto Nazionale di Geofisica, Roma, Italy;(3) Laboratory for Extraterrestrial Physics, NASA/GSFC, Greenbelt, USA;(4) Dipartimento di Fisica, Universita’ di Roma-Tor Vergata, Italy |
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| 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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| Keywords: | Magnetospheric physics (MHD waves and instabilities solar wind - magnetosphere interactions) |
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