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Electromagnetic radiation trapped in the magnetosphere above the plasma frequencyAn electromagnetic noise band is frequently observed in the outer magnetosphere by the Imp 6 spacecraft at frequencies from about 5 to 20 kHz. This noise band generally extends throughout the region from near the plasmapause boundary to near the magnetopause boundary. The noise typically has a broadband field strength of about 5 microvolts/meter. The noise band often has a sharp lower cutoff frequency at about 5 to 10 kHz, and this cutoff has been identified as the local electron plasma frequency. Since the plasma frequency in the plasmasphere and solar wind is usually above 20 kHz, it is concluded that this noise must be trapped in the low-density region between the plasmapause and magnetopause boundaries. The noise bands often contain a harmonic frequency structure which suggests that the radiation is associated with harmonics of the electron cyclotron frequency.
Document ID
19740032621
Document Type
Reprint (Version printed in journal)
Authors
Gurnett, D. A.
Shaw, R. R.
(Iowa, University Iowa City, Iowa, United States)
Date Acquired
August 7, 2013
Publication Date
December 1, 1973
Publication Information
Publication: Journal of Geophysical Research
Volume: 78
Subject Category
Geophysics
Report/Patent Number
AD-773575
Funding Number(s)
CONTRACT_GRANT: NAS5-11704
CONTRACT_GRANT: N00014-68-A-0196-0003
CONTRACT_GRANT: NGL-16-001-043
Distribution Limits
Public
Copyright
Other
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