Physics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..301k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, Feb. 1991, p. 301-304.
Physics
5
Earth Magnetosphere, Exos Satellites, Exos-D Satellite, Extremely Low Radio Frequencies, Plasma Waves, Plasmasphere, Electric Fields, Field Aligned Currents, Geomagnetism, Gyrofrequency, Protons, Spectral Bands
Scientific paper
Measurements of ELF (below 50 Hz) waves in the near-equatorial region of the plasmasphere are reported. Data obtained with the three-axis search-coil instruments of the Japanese EXOS-D satellite during March-October 1989 are presented graphically and briefly characterized. EM noise with multiband structure was detected mainly at frequencies above the local He(+) gyrofrequency in the region with L = 1.5-2.5 during daytime on 49 of 250 orbits, whereas broadband ELF noise in the same frequency range was detected on 10 orbits. No absorption at the local proton gyrofrequency was observed, and simultaneous electric-field measurements indicate a spectral cutoff at 1.3-2.5 times the He(+) gyrofrequency.
Fukunishi Hiroshi
Hayashi Kumiko
Kimura Isao
Kokubun Susumu
Takami Masakazu
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