NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
DE-1 observations of ordinary mode and extraordinary mode auroral kilometric radiationObservations of auroral kilometric radiation (AKR) made with the Dynamics Explorer (DE-1) indicate the presence of both ordinary and extraordinary wave modes. Although the two modes usually occur separately, they are sometimes observed together. When both modes are present, the ordinary-mode component tends to occur at lower frequencies and with lower amplitudes than those of the accompanying extraordinary-mode component. On the other hand, the local electron gyrofrequency is an absolute lower frequency cutoff for both modes. Ordinary mode intensities are proportional to extraordinary mode intensities but less by roughly a factor of 50. Extraordinary mode ray paths are generally confined to a cone within 50 degrees of the source magnetic field direction and ordinary mode emissions are typically observed outside of this cone. This behavior suggests that both components are produced within the same source region but are then refracted differently as they escape.
Document ID
19850035941
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mellott, M. M.
(Iowa Univ. Iowa City, IA, United States)
Calvert, W.
(Iowa Univ. Iowa City, IA, United States)
Huff, R. L.
(Iowa Univ. Iowa City, IA, United States)
Gurnett, D. A.
(Iowa, University Iowa City, IA, United States)
Shawhan, S. D.
(NASA Headquarters Washington, DC United States)
Date Acquired
August 12, 2013
Publication Date
December 1, 1984
Publication Information
Publication: Geophysical Research Letters
Volume: 11
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
85A18092
Funding Number(s)
CONTRACT_GRANT: NGL-16-001-043
CONTRACT_GRANT: NAS5-25690
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available