Magnetospheric chorus - Amplitude and growth rate

Details Magnetospheric chorus - Amplitude and growth rate Magnetospheric chorus - Amplitude and growth rate

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).

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