Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm21a..06l&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #SM21A-06
Physics
2704 Auroral Phenomena (2407), 2744 Magnetotail, 2772 Plasma Waves And Instabilities (2471), 2788 Magnetic Storms And Substorms (7954)
Scientific paper
THEMIS observations have indicated that wave propagation by ideal MHD waves may not be fast enough to account for the timing of events during substorms. The question then arises if non-MHD wave modes or particle propagation could convey information through the tail during substorms. Kinetic Alfven waves have a faster group velocity than MHD Alfven waves, but also suffer wave damping. Whistler mode waves can travel much faster than the Alfven speed for parallel propagation, but not for perpendicular propagation. In addition, observations of whistler mode waves at sufficient amplitudes to carry significant amounts of energy have not been observed to our knowledge. Of course, electrons can travel at speeds much larger than MHD wave speeds, but must overcome the mirror force to reach the inner magnetosphere to produce the aurora. The physics of each of these modes of transport will be investigated to assess the roles each may play in the substorm process.
Lin Nan
Lysak Robert L.
Song Yushu
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