Pc3 pulsations during variable IMF conditions

International audience 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 freque...

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Bibliographic Details
Main Authors: Villante, U., Lepidi, S., Francia, P., Vellante, M., Meloni, A., Lepping, R. P., Mariani, F.
Other Authors: Dipartimento di Fisica, Istituto Nazionale di Geofisica, GSFC Laboratory for Extraterrestrial Physics, NASA Goddard Space Flight Center (GSFC)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 1999
Subjects:
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences
Terra Nova Bay
Antarc*
Antarctica
Online Access:https://hal.science/hal-00316569
https://hal.science/hal-00316569/document
https://hal.science/hal-00316569/file/angeo-17-490-1999.pdf
Description
Summary:International audience 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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