Physics
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000angeo..18..411c&link_type=abstract
Annales Geophysicae, vol. 18, Issue 4, pp.411-415
Physics
4
Scientific paper
A 16 mHz Pc4 pulsation was recorded on March 17, 1998, in the prenoon sector of the Earth's magnetosphere by the Equator-S satellite. The event is strongly localized in radial direction at approximately L = 5 and exhibits properties of a field line resonance such as an ellipticity change as seen by applying the method of the analytical signal to the magnetic field data. The azimuthal wave number was estimated as m approx 150. We discuss whether this event can be explained by the FLR mechanism and find out that the change in ellipticity is more a general feature of a localized Alfvén wave than indicative of a resonant process.
Auster Hans-Ulrich
Baumjohann Wolfgang
Cramm Ruediger
Fornacon Karl-Heinz
Georgescu Edita
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