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Longitudinal variations of very-low-frequency chorus activity in the magnetosphere - Evidence of excitation by electrical power transmission linesThe distribution of VLF chorus in the high-altitude magnetosphere as detected by the Ogo 3 satellite was investigated. Chorus occurrence frequency over 4,668 samples of 5 min of broadband data was computed for Northern Hemisphere bins of 10 deg by 10 deg in dipole invariant latitude and longitude. Peaks in activity were noted over Alaska, the eastern U.S. and Canada, western Europe, and western Siberia, and were shown not to be the result of biased sampling. It is suggested that power line radiation of only about 1 W or less at a given harmonic frequency may be sufficient to stimulate the observed chorus activity and that such power levels can be expected in industrial areas or from large distribution networks. Preliminary results show that chorus starting frequencies are highly correlated with 60 Hz harmonics in the American sector and with 50 Hz harmonics in the European sector.
Document ID
19770059877
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Luette, J. P.
(Stanford Univ. CA, United States)
Park, C. G.
(Stanford Univ. CA, United States)
Helliwell, R. A.
(Stanford University Stanford, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
July 1, 1977
Publication Information
Publication: Geophysical Research Letters
Volume: 4
Subject Category
Geophysics
Accession Number
77A42729
Funding Number(s)
CONTRACT_GRANT: NSF ATM-74-20084
CONTRACT_GRANT: NGL-05-020-008
Distribution Limits
Public
Copyright
Other

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