Control of VLF burst activity in the nightside ionosphere of Venus by the magnetic field orientation

Details Control of VLF burst activity in the nightside ionosphere of Venus by the magnetic field orientation Control of VLF burst activity in the nightside ionosphere of Venus by the magnetic field orientation

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9711673h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. E7, July 25, 1992, p. 11,673-11,680.

Other

13

Night, Planetary Ionospheres, Planetary Magnetic Fields, Planetary Radiation, Radio Bursts, Venus Atmosphere, Very Low Frequencies, Ion Acoustic Waves, Pioneer Venus Spacecraft, Whistlers

Scientific paper

A burst identificaton method developed by Ho et al. (1991) is used to analyze data on the nightside ionosphere of Venus in order to determine whether VLF bursts observed there are better interpreted as whistler mode waves or ion acoustic waves. The correlation between burst occurrence and the angle between the magnetic field and the radial direction, as well as the spacecraft flight direction are examined. Narrow-band 100-Hz bursts are found to be more frequently associated with radial magnetic fields while wideband signals are more frequently associated with horizontal fields. Under the assumption of vertical propagation, the normalized 100-Hz burst rate inside the resonance cone is larger than that outside. The burst rate inside the resonance cone dominates the altitude distribution. By assuming vertical propagation, the 100-Hz signals clearly divide into two populations. One is whistler mode propagating inside the resonance cone. The other is a nonpropagating mode outside the resonance cone which decreases quickly with altitude with a scale height of about 20 km.

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