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Isis 1 observations at the source of auroral kilometric radiationObservations of auroral kilometric radiation (AKR) were made by Isis 1 in the source region. The radiation is found to be generated in the extraordinary mode just above the local cut-off frequency and to emanate nearly perpendicular to the magnetic field. It occurs within local depletions of electron density, where the ratio of plasma frequency to cyclotron frequency is less than 0.2. The density depletion is restricted to altitudes above about 2000 km, and the upper AKR frequency limit corresponds to the extraordinary cut-off frequency at this altitude. AKR is observed from Isis 1 above the nighttime auroral zone over a wider extent in longitude than in latitude with an intense source region observed most often near 2200 LMT and 70 deg invariant latitude. It is directly related to inverted V electron precipitation events with an electron-to-wave energy conversion efficiency of the order of 0.1 to 1%.
Document ID
19790057276
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Benson, R. F.
(NASA Goddard Space Flight Center Laboratory for Planetary Atmospheres, Greenbelt, Md., United States)
Calvert, W.
(Maryland, University College Park, Md.; Colorado, University, Boulder, Colo., United States)
Date Acquired
August 9, 2013
Publication Date
June 1, 1979
Publication Information
Publication: Geophysical Research Letters
Volume: 6
Subject Category
Geophysics
Accession Number
79A41289
Funding Number(s)
CONTRACT_GRANT: NGR-21-002-096
Distribution Limits
Public
Copyright
Other

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