Other
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9813565l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A8, p. 13,565-13,574.
Other
15
Auroras, Electric Fields, Magnetic Fields, Wave-Particle Interactions, Whistlers, Electron Energy, Field Aligned Currents, Radio Emission, Viking Spacecraft
Scientific paper
Simultaneous observations by the Viking satellite of electric and magnetic fields as well as charged particles have been used to investigate V-shaped wave phenomena. The intensity of these VLF and ELF emissions is V-shaped when shown in a frequency versus time plot. Simultaneous observations of V-shaped so-called VLF saucer emissions, particles and field-aligned currents strongly suggest, for the first time, that upgoing electrons with energies less than a few hundred electron volts can generate these waves. Broadband waves observed inside the saucer generation region, from frequencies much less than the ion cyclotron frequency up to the plasma frequency, may also be generated by these electrons. Viking observations of VLF saucers at altitudes between 4000 km and 13,500 km show that these emissions occur at higher altitudes than discussed in previous reports. The generation regions seem to be more extended at these higher altitudes than what has been reported at lower altitudes by other observers.
André Martial
Bahnsen Axel
Blomberg Lars G.
Erlandson Robert E.
Lonnqvist H.
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