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side-band mutual interactions in the magnetosphereSideband mutual interactions between VLF waves in the magnetosphere are investigated. Results of an experimental program involving the generation of sidebands by means of frequency shift keying are presented which indicate that the energetic electrons in the magnetosphere can interact only with sidebands generated by signals with short modulation periods. Using the value of the memory time during which electrons interact with the waves implied by the above result, it is estimated that the length of the electron interaction region in the magnetosphere is between 4000 and 2000 km. Sideband interactions are found to be similar to those between constant-frequency signals, exhibiting suppression and energy coupling. Results from a second sideband transmitting program show that for most cases the coherence bandwidth of sidebands is about 50 Hz. Sideband mutual interactions are then explained by the overlap of the ranges of the parallel velocity of the electrons which the sidebands organize, and the wave intensity in the interaction region is estimated to be 2.5-10 milli-gamma, in agreement with satellite measurements.
Document ID
19800048529
Document Type
Reprint (Version printed in journal)
Authors
Chang, D. C. D.
(Hughes Aircraft Co., Space and Communications Group, Los Angeles Calif., United States)
Helliwell, R. A.
(Hughes Space and Communications Group Los Angeles, CA, United States)
Bell, T. F.
(Stanford University Stanford, Calif., United States)
Date Acquired
August 10, 2013
Publication Date
April 1, 1980
Publication Information
Publication: Journal of Geophysical Research
Volume: 85
Subject Category
GEOPHYSICS
Funding Number(s)
CONTRACT_GRANT: NSF DPP-76-82646
CONTRACT_GRANT: NGL-05-020-008
CONTRACT_GRANT: NSF ATM-75-07707
Distribution Limits
Public
Copyright
Other