Computer Science – Sound
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm41b1188d&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SM41B-1188
Computer Science
Sound
2431 Ionosphere/Magnetosphere Interactions (2736), 2443 Midlatitude Ionosphere, 2471 Plasma Waves And Instabilities (2772), 2772 Plasma Waves And Instabilities (2471)
Scientific paper
ULF waves are observed on the ground by virtue of their propagation through the ionosphere. The wave fields may drive perturbations of the ionospheric plasma during this process. In order to investigate this we established and operated a large low latitude array of magnetometers and HF Doppler sounders. We examined in detail the ionosphere-ground power and phase properties over the 5-150 mHz frequency range, and used cross-phase techniques to identify the local field line resonance frequency. We found that downward propagating ULF waves always produce an ionospheric Doppler shift signature. For waves away from the local FLR there is an almost constant ionosphere-ground phase difference, while at the resonance frequency there is a sudden sharp peak in amplitude and decrease in the cross-phase. These features can be used to detect resonance harmonics at low latitudes more clearly than with ground magnetometer data alone. Finally, we outline a boundary value model of wave propagation that explains these observations.
Dunlop I.
Menk F.
Waters Christopher
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