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Intensity variation of ELF hiss and chorus during isolated substormsElectromagnetic ELF emissions (100-1000 Hz) observed on the polar-orbiting OGO-6 satellite within three hours of the dawn-dusk meridian consistently exhibit a predictable response to isolated substorm activity. Near dawn, the emissions intensify during the substorm and then subside following the magnetic activity; the waves are most intense at L greater than 4, exhibit considerable structure and have been primarily identified as chorus. At dusk the response is entirely different; the wave intensity falls to background levels during substorm activity but subsequently intensifies, usually reaching levels well in excess of that before the disturbance. The emissions near dusk extend to low L, are relatively featureless, and have been identified as plasmaspheric hiss. These features are interpreted in terms of changes in the drift orbits of outer-zone electrons which cyclotron resonate with ELF waves.
Document ID
19740061452
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Thorne, R. M.
Fiske, K. F.
Church, S. R.
(California, University Los Angeles, Calif., United States)
Smith, E. J.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena Calif., United States)
Date Acquired
August 7, 2013
Publication Date
September 1, 1974
Publication Information
Publication: Geophysical Research Letters
Volume: 1
Subject Category
Geophysics
Report/Patent Number
NSSDC-ID-69-051A-22-PM
Accession Number
74A44202
Funding Number(s)
CONTRACT_GRANT: NSF GA-34148
CONTRACT_GRANT: NAS7-100
CONTRACT_GRANT: NSF GA-28045
Distribution Limits
Public
Copyright
Other

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