Physics
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990p%26ss...38.1335k&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 38, Oct. 1990, p. 1335-1341.
Physics
55
Extremely Low Frequencies, Magnetic Equator, Plasma Waves, Very Low Frequencies, Hiss, Scatha Satellite, Spatial Distribution
Scientific paper
This paper reports the results of a survey of ELF/VLF wave activity in the frequency range from 100 Hz to 5 kHz observed by the SCATHA satellite near the magnetic equator between 5 and 8 R(E). The typical wave environment in this region is required to assess the role of each type of wave in transport processes, such as the pitch-angle diffusion of electrons, occurring in the outer magnetosphere. Hiss, discrete whistler-mode emissions, and electron cyclotron harmonic waves occur within the frequency range of the SCATHA VLF receiver. Hiss is predominantly observed between noon and dusk where the satellite frequently enters the plasmasphere. Discrete whistler-mode emissions occur over 60 percent of the time between 03:00 and 12:00 LT. A surprising result of the survey is the absence of activity in the local time sector from 18 to 21 h. No wave activity above the receiver noise level, 5 x 10 to the -7th V/m per sq rt Hz was detected during 50 percent of the broadband data acquisitions in this region.
Koons Harry C.
Roeder James L.
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