Ground-satellite coordinated study of the April 5, 1979 events - Observation of O(+) cyclotron waves

Details Ground-satellite coordinated study of the April 5, 1979 events - Observation of O(+) cyclotron waves Ground-satellite coordinated study of the April 5, 1979 events - Observation of O(+) cyclotron waves

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgzg...55..134i&link_type=abstract

Journal of Geophysics - Zeitschrift für Geophysik (ISSN 0340-062X), vol. 55, Sept. 1984, p. 134-141.

Physics

Geophysics

22

Geomagnetic Pulsations, Ion Cyclotron Radiation, Magnetospheric Instability, Oxygen Ions, Space Plasmas, Atmospheric Composition, Flux (Rate), Geos 2 Satellite, Pitch (Inclination)

Scientific paper

In a period of particularly large magnetospheric disturbance, large amplitude pc2 waves were observed in the late dawn sector on GEOS-2 and in the vicinity of the foot-point of the satellite's field line. The waves have dominantly left-hand polarization and their frequency is closely correlated to the O(+) gyrofrequency in the magnetosphere. After the start of the pc2 activity, the GEOS-2 particle detectors measured an enhanced flux of energetic O(+) ions in the energy range from 0.9-16 keV. By calculating the dispersion of ion cyclotron waves in a multicomponent plasma, it is shown that the energetic O(+) ions can destabilize the observed pc2 waves.

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