Physics
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985georl..12..613t&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 12, Sept. 1985, p. 613-616. DOE-sponsored research.
Physics
15
Geomagnetic Micropulsations, Magnetic Storms, Planetary Waves, Plasma Density, Wave Propagation, Electric Fields, International Sun Earth Explorers, Magnetic Fields, Standing Waves
Scientific paper
A compressional Pc5 was observed on an ISEE 1 and 2 outbound path on September 28, 1981 at L = 5.6-7.3 near the magnetic equator at about 10 hr local time during the recovery phase of a geomagnetic storm. The wave propagated westward with a large azimuthal wave number of about 30 and exhibited in-phase oscillations of plasma density and magnetic field magnitude. During this event, component-dependent variations in phase and amplitude were observed for the magnetic field oscillations. The radial and compressional components had a constant phase and their amplitude was finite. In contrast, the azimuthal component changed its phase by 180 deg and its amplitude became zero during the middle of the wave event. The observation as indicating the spatial structure of the Pc5 wave is interpreted. The polarization reversal is likely to be caused by a crossing of a node of a standing wave located 4 deg above the geomagnetic equator.
Anderson Rachel
Russell Christopher T.
Takahashi Keitaro
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