Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa51d1966p&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA51D-1966
Physics
[2730] Magnetospheric Physics / Magnetosphere: Inner, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2752] Magnetospheric Physics / Mhd Waves And Instabilities, [2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions
Scientific paper
We examine the global characteristics of an event of ULF waves associated with the SI onset of June 8, 2000. A highly monochromatic, large-amplitude wave at ≈3.3 mHz was observed by GOES8 on the dawn side of the magnetosphere and across a wide number of ground stations. The combination of the long period of these pulsations (≈5 min), their extended duration (~40 min) and the latitude independent frequency over a wide longitudinal array support the hypothesis of a cavity/waveguide mode driven by the solar wind pressure enhancement. On the ground, the results of the amplitude and cross-phase analysis and the LT and latitudinal dependence of the polarization pattern reveal the occurrence of field line resonance (FLR) at λ~71° in the morning sector. In the nightside, the FLR occurred at latitude (λ≈67°) lower than expected for typical solar wind conditions, suggesting a significant reduction of the local field line eigenfrequency as compared to its usual value. A model estimation (time of flight approximation) of the field line eigenfrequencies confirms that this feature was caused by a change in the magnetospheric field geometry characterized by a more stretched field lines in antisolar direction.
Coco I.
Piersanti M.
Villante Umberto
Waters Colin L.
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