Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/3934
AuthorsLepidi, S.* 
Francia, P.* 
Villante, U.* 
Meloni, A.* 
Lazarus, A. J.* 
Lepping, R. P.* 
TitleThe Earth's passage of the April 11, 1997 coronal ejecta: geomagnetic field fluctuations at high and low latitude during northward interplanetary magnetic field conditions
Issue Date1999
Series/Report no.10 / 17 (1999)
URIhttp://hdl.handle.net/2122/3934
KeywordsMagnetospheric 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::01.03.04. Structure and dynamics 
AbstractAn analysis of the low frequency geomagnetic field fluctuations at an Antarctic (Terra Nova Bay) and a low latitude (L'Aquila, Italy) station during the Earth's passage of a coronal ejecta on April 11, 1997 shows that major solar wind pressure variations were followed at both stations by a high fluctuation level. During northward interplanetary magnetic field conditions and when Terra Nova Bay is close to the local geomagnetic noon, coherent fluctuations, at the same frequency (3.6 mHz) and with polarization characteristics indicating an antisunward propagation, were observed simultaneously at the two stations. An analysis of simultaneous measurements from geosynchronous satellites shows evidence for pulsations at approximately the same frequencies also in the magnetospheric field. The observed waves might then be interpreted as oscillation modes, triggered by an external stimulation, extending to a major portion of the Earth's magnetosphere.
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