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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/33638

Title
ULF Doppler oscillations in the low latitude ionosphere
Author/Creator
Menk, Frederick W.;  Waters, Colin L.;  Dunlop, Ian S.
Institution
The University of Newcastle. Faculty of Science & Information Technology, School of Environmental and Life Science
Description
An array of magnetometers and Doppler sounders spanning L = 1.56–2.77 was used to examine perturbations in the daytime ionosphere driven by downgoing ULF waves. For frequencies away from the local field line resonance (FLR), the waves caused mostly vertical motions of the F-region plasma with amplitude ∼0.03–0.06 Hz/nT, with a phase delay of 30° to 40° at the ground. At the local resonant frequency and harmonics the amplitude and phase delay increased markedly. We modeled this by considering an admixture of ULF wave modes and oblique magnetic field geometry, and using actual ionospheric parameters. The model results agree well with observations when the downgoing wave mode varies smoothly from pure fast mode away from the resonance to mostly transverse mode at resonance. These results provide new information on the interaction between downgoing ULF waves and the ionospheric plasma.
Relation
Geophysical Research Letters Vol. 34, Issue 10
Publisher Link
http://dx.doi.org/10.1029/2007GL029300
Date
2007
Publisher
American Geophysical Union
Keyword(s)
ULF Doppler oscillations;  low latitude ionosphere;  magnetometers;  Doppler sounders;  ULF wave modes;  oblique magnetic field geometry;  onospheric parameters;  ionospheric plasma
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/33638
Identifier
ISSN:0094-8276
Reviewed
Reviewed
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Subject
"Geophysical Research Letters"
 
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