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A search for geographic control on the occurrence of magnetospheric ELF emissionsSearch coil magnetometer data obtained in the magnetosphere on Ogo 5 and Ogo 6 were studied for evidence of man-induced stimulation of the two dominant electromagnetic emissions, chorus and plasmaspheric hiss. Variability of chorus with geographic longitude and enhancements, onsets, and quantum jumps in chorus emissions at frequencies related to harmonics of the earth's transmission lines are discussed. The enhancement of weak emissions in the 340-360 deg dipole longitude region during quiet geomagnetic conditions is present only when ELF hiss is weak, and will not contribute to the non-adiabatic dynamics of radiation belt electrons. It is concluded that the data analyzed is consistent with a predominantly natural origin for chorus and plasmaspheric hiss, and that triggered waves do not play a major role in the non-adiabatic dynamics of geomagnetically trapped electrons.
Document ID
19790064312
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Tsurutani, B. T.
(California Institute of Technology, Jet Propulsion Laboratory, Physics Section, Pasadena Calif., United States)
Church, S. R.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Thorne, R. M.
(California, University Los Angeles, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
August 1, 1979
Publication Information
Publication: Journal of Geophysical Research
Volume: 84
Subject Category
Geophysics
Accession Number
79A48325
Funding Number(s)
CONTRACT_GRANT: NAS7-100
CONTRACT_GRANT: NSF ATM-77-22346
CONTRACT_GRANT: NSF ATM-75-01431-A02
Distribution Limits
Public
Copyright
Other

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