Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm31b..05s&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM31B-05
Physics
2736 Magnetosphere/Ionosphere Interactions, 2740 Magnetospheric Configuration And Dynamics, 2752 Mhd Waves And Instabilities, 2760 Plasma Convection, 2788 Storms And Substorms
Scientific paper
A combination of simultaneous measurements from high-altitude, low-altitude and ground-based instruments is used to explore the large-scale coherence of ULF pulsations in the magnetosphere. Periodogram analysis of measurements at various regions of the magnetosphere reveals that the energy in the pulsations is consistently concentrated in a few discrete peaks. These peaks are found simultaneously in the westward electrojet intensifications, geosynchronous dipolarizations and energetic particle injections, plasma and magnetic field oscillations in the plasma sheet, and magnetic field oscillations in the tail lobes. The evolution of the large-scale correlation of the magnetosphere is tracked by examining the correlation matrix over successive time intervals. High correlation over a wide spatial range is observed for certain periods. These observations suggest that the magnetosphere-ionosphere system can act as a coherent system in which the coupling of resonances at various regions of the magnetosphere can modulate large-scale processes.
Cosgrove Russell
Sanchez Ennio R.
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