Physics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.5668p&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 88, July 1, 1983, p. 5668-5676.
Physics
21
Atmospheric Electricity, Earth Ionosphere, Geomagnetic Pulsations, Magnetohydrodynamic Waves, Space Plasmas, Geomagnetic Latitude, Magnetometers, Power Spectra, Radar Measurement
Scientific paper
The spatial variation of the hydromagnetic wave electric fields in the ionosphere are investigated using STARE radar observations of a Pg (giant) pulsation. Both the north-south and east-west electric fields are found to exhibit resonant behavior, while the oscillation is confined to approximately 2 deg of latitude and both components have similar amplitude maxima of order 40 mV/m. The longitudinal phase variations are found to yield an azimuthal wave of approximately 17, and the corresponding ionospheric phase velocity is determined to be 8 km/s westward. In spite of the apparent resonance, the magnitude of the east-west electric field is found to be considerably larger than for previous reports of Pc 5 thought to originate in the Kelvin-Helmholtz instability on the magnetopause. It is concluded that the Pg may be an even mode oscillation generated by a bounce resonance instability.
Allan W.
Glassmeier Karl-Heintz
Nielsen Edward
Poulter E. M.
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