Mathematics – Logic
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9615697r&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Sept. 1, 1991, p. 15,697-15,710. Research supported by NSERC.
Mathematics
Logic
101
Coherent Radar, Geomagnetic Micropulsations, High Frequencies, Meteorological Radar, Coherent Scattering, Geomagnetic Tail, Kelvin-Helmholtz Instability, Magnetic Field Configurations, Magnetohydrodynamic Flow, Night Sky, Plasma Drift, Solar Terrestrial Interactions
Scientific paper
The 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.
Baker Kile B.
Greenwald Ray A.
Ruohoniemi Michael J.
Samson John C.
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