Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm41b0823m&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM41B-0823
Physics
2724 Magnetopause, Cusp, And Boundary Layers, 2736 Magnetosphere/Ionosphere Interactions, 2752 Mhd Waves And Instabilities, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
In spite of accumulated observations of ULF pulsations, there is no satisfactory explanation for the generation and transmission mechanisms of Pc 3 pulsations at very high latitudes. We have studied the characteristics of high-latitude Pc 3 pulsations using ionospheric data acquired by the Super Dual Auroral Radar Network (SuperDARN) of HF radars, and on the ground by magnetometer stations under the fields of view of the radars. In order to investigate the origin of the pulsations, we have also used solar wind and magnetosheath magnetic field data. The observations revealed that there is a clear peak in the Pc 3 power near the cusp latitudes and that the latitudinal power decreases more steeply than previously reported. Furthermore, we have found that compressional magnetic field variations in the magnetosheath correlate well with pulsations in the spectra and amplitude. The results suggest that the driving source of the pulsations is located in the magnetosheath, and that part of the energy of the driving source is then transmitted to the ionosphere along the cusp/LLBL magnetic field lines.
Fraser Brian J.
Goka Tateo
Matsuoka Hiroshi
Sato Naoko
Sofko George J.
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