Physics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986p%26ss...34..863g&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 34, Sept. 1986, p. 863-877.
Physics
5
Geomagnetic Micropulsations, Magnetometers, Magnetospheric Instability, Satellite Observation, Synchronous Satellites, Ats 6, Plasma Density, Resonance, Standing Waves
Scientific paper
Results from the analysis of magnetometer measurements of one of the clearest observations of a double resonance Pc4 pulsation to date are presented. The Pc4, with a period of 55 s, was measured by 18 ground magnetometers and also on board the ATS-6 satellite at geostationary orbit. A model of the variation of plasma density, and hence eigenperiods, within the magnetosphere is developed. In this model it is suggested that hydromagnetic field line resonances occur in the plasmatrough and in the plasmasphere, which are the second and fundamental harmonic guided toroidal mode resonance, respectively. The model also makes it possible to evaluate the damping experienced by hydromagnetic standing waves in the magnetosphere.
Gough H.
Orr Daniel
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