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HF radar observations of Pc 5 field line resonances in the midnight/early morning MLT sectorThe technique of F region sounding by HF coherent radar is applied to the study of field line resonances equatorward of a region of shear flow in the early morning sector. The motions were predominantly in the geomagnetic east-west direction, indicating north-south electric fields. These oscillations had pronounced peaks in their latitudinal power distribution. For the pulsation at 1.95 mHz, a latitudinal phase shift of 180 deg was observed across the peaks in all the look directions of the radar, and a longitudinal wavelength corresponding to an m value of 3 was obtained. For the 2.6-mHz pulsation, the phase shifts across the peaks had a variation with a look direction that indicated a significant longitudinal as well as latitudinal variation; for this activity, an m value of about 16 is estimated. These features are interpreted in terms of the field line resonance theory, and the possible sources of the pulsation energy are discussed.
Document ID
19910067356
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Ruohoniemi, J. M.
(Johns Hopkins Univ. Laurel, MD, United States)
Greenwald, R. A.
(Johns Hopkins Univ. Laurel, MD, United States)
Baker, K. B.
(Johns Hopkins University Laurel, MD, United States)
Samson, J. C.
(Alberta, University Edmonton, Canada)
Date Acquired
August 14, 2013
Publication Date
September 1, 1991
Publication Information
Publication: Journal of Geophysical Research
Volume: 96
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
91A51979
Funding Number(s)
CONTRACT_GRANT: NSF ATM-87-13982
CONTRACT_GRANT: NSG-7055
Distribution Limits
Public
Copyright
Other

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