Computer Science – Sound
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..921k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, June 1990, p. 921-924. Research supported by USAF and DNA.
Computer Science
Sound
56
Atmospheric Sounding, Auroral Zones, Doppler Effect, Magnetohydrodynamic Waves, Rocket Sounding, Satellite Observation, Earth Ionosphere, Electric Fields, Geomagnetism, Magnetic Field Configurations
Scientific paper
This paper presents and analyzes sounding rocket and HILAT satellite measurements of the low-frequency electric and magnetic fields perpendicular to the earth's magnetic field in the auroral oval. By examining the time-domain field data, it is often difficult to distinguish temporal fluctuations from static structures which are Doppler-shifted to a nonzero frequency in the spacecraft frame. However, it is shown that such a distinction can be made by constructing the impedance function A(f). Using Z(f), agreement is found with the static field interpretation below about 0.1 Hz in the spacecraft frame.
Boehm Manfred
Earle Gregory D.
Kelley Michael C.
Knudsen David J.
Vickrey James F.
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