Physics
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsm24a..04m&link_type=abstract
American Geophysical Union, Spring Meeting 2008, abstract #SM24A-04
Physics
2700 Magnetospheric Physics (6939), 2730 Magnetosphere: Inner, 2772 Plasma Waves And Instabilities (2471), 2784 Solar Wind/Magnetosphere Interactions, 2790 Substorms
Scientific paper
In this study we characterize the simultaneous effect of the substorm on the night and dayside magnetosphere. We use the wavelet transform along with significance testing, polarization, and coherence to extract wave information from magnetometer traces. We examine the wave information for propagation of the Pi 2 from the nightside to the dayside, signs of a cavity mode in the night and day Pi 2 amplitude at different L shells, and signs of a cavity mode in the frequencies surrounding the Pi 2 band. The study also examines other possible sources of dayside wave modulation such as periodicities in the solar wind dynamic pressure. We found indications of a nightside cavity mode in wave activity greater than 30 mHz. The amplitude of an average dayside Pi 2 peaks approximately 9 minutes after substorm onset where the peak amplitude on the nightside occurs at onset. However, the number of significant waves in the dayside Pi 2 band increases slightly at onset. This suggests there is a weak but global substorm effect on the magnetosphere. The dayside Pi 2 occurring 9 minutes after onset is a monochromatic peak and a harmonic of a peak in the 1-7 mHz band. Periodicities in the solar wind ram pressure are present but are too weak to cause this dayside monochromatic signature. The timing of the delayed, dayside Pi 2 suggests a correlation with the substorm expansion phase and field line resonances initiated by the aurora.
Martin Pamela
Moldwin Mark
Rassoul Hamid
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