Physics
Scientific paper
Aug 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.3265b&link_type=abstract
Journal of Geophysical Research, vol. 80, Aug. 1, 1975, p. 3265-3270.
Physics
15
Atmospheric Radiation, Magnetospheric Instability, Radio Emission, Very Low Frequencies, Whistlers, Amplitudes, Chirp Signals, Decay Rates, Emission Spectra, Time Response
Scientific paper
A new study of the amplitude of magnetospheric chorus with 1966-1967 data from the Stanford University/Stanford Research Institute VLF receivers on Ogo 1 and Ogo 3 has confirmed the band-limited character of magnetospheric chorus in general and the double-banding of near-equatorial chorus. Chorus amplitude tended to be inversely correlated with frequency, implying lower intensities at lower L values. Individual chorus emissions often showed a characteristic amplitude variation, with rise times of 10 to 300 ms, a short duration at peak amplitude, and decay times of 100 to 3000 msec. Growth was often approximately exponential, with rates from 200 to nearly 2000 dB/sec. Rate of change of frequency was found in many cases to be independent of emission amplitude, in agreement with the cyclotron feedback theory of chorus (Helliwell, 1967, 1970).
Burtis W. J.
Helliwell Robert A.
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