Physics
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.3943c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, April 1, 1990, p. 3943-3957.
Physics
30
Auroral Echoes, Cyclotron Frequency, Magnetoionics, Radio Emission, Terrestrial Radiation, Dynamics Explorer 1 Satellite, Kilometric Waves, Polarization (Waves), Whistlers
Scientific paper
The nature of the magnetoionic wave modes which accompany the aurora is clarified here by a detailed analysis, using multiple techniques, of DE 1 auroral radio observations. All four of the possible magnetoionic wave modes are found to occur, apparently emitted from two different source regions on the same auroral field line. AKR originates primarily in the X mode near the electron cyclotron frequency, and is frequently also accompanied by a weaker O-mode component from the same location. The next most prominent auroral emission is the W-mode auroral hiss originating from altitudes always well below the DE 1 satellite at frequencies below the local cyclotron frequency. The previously reported Z-mode auroral radiation was also detected, but from sources also below the satellite at the poleward edge of the cavity, and not from the expected AKR source at the cyclotron frequency.
Calvert Wynne
Hashimoto Kozo
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