Physics
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.4267k&link_type=abstract
Journal of Geophysical Research, vol. 84, Aug. 1, 1979, p. 4267-4276.
Physics
6
Geomagnetic Pulsations, Magnetopause, Ogo-5, Time Response, Cold Plasmas, Dynamic Pressure, Geomagnetism, Ion Cyclotron Radiation, Ionic Waves, Magnetic Equator, Magnetic Fields, Magnetosheath, Perturbation Theory, Solar Wind Velocity
Scientific paper
High time resolution measurements made inside the magnetopause from L = 7 to L = 14 by the flux gate magnetometer aboard the Ogo 5 satellite, which demonstrate that the Pc 1-2 magnetic field oscillations are present in the outer magnetosphere, are examined. The solar wind dynamic pressure and the magnetospheric cold plasma were enhanced, and the IMF had a southward component 2 hours before the events, but there was no significant correlation between the time of the events and either storm recovery phase or substorm onset. The magnetic field perturbations in each event were transverse to the ambient field with amplitudes from 2 to 8 gamma, and most of the transverse perturbations showed left-handed polarization. Excursions into the magnetosheath during two events revealed a disturbed magnetic field with significant power in frequencies of minimum 0.1 Hz, and although the magnetosheath was a source of free energy for waves at Pc 1-2 frequencies, the data within the magnetosphere suggest that the observed pulsations were ion cyclotron waves generated at the geomagnetic equator at large radial distances.
Galland Kivelson Margaret
Kaye Stanley M.
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