Simultaneous observations of PC3 pulsations in the magnetosphere and on the ground: Control by the solar wind

Details Simultaneous observations of PC3 pulsations in the magnetosphere and on the ground: Control by the solar wind Simultaneous observations of PC3 pulsations in the magnetosphere and on the ground: Control by the solar wind

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983stin...8428717a&link_type=abstract

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Physics

Earth Magnetosphere, Magnetospheric Instability, Solar Wind, Cyclotron Resonance, Geos Satellites (Esa), Magnetic Measurement

Scientific paper

Three cases of Pc3 observations by the GEOS-1 and GEOS-2 magnetometers are presented. The same events were recorded by a ground station. All cases indicate clearly that the onset of the oscillations occurs when the IMF direction turns close to the archimedean spiral; the oscillations disappear when the IMF direction turns along the west-east line. It is also found that the modulation of the amplitude of the oscillations depends on the value of the solar wind cone angle. The results can be interpreted in terms of generation of Pc3 waves by cyclotron instability upstream of the bow shock.

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