Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm12a0470s&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM12A-0470
Physics
2704 Auroral Phenomena (2407), 2708 Current Systems (2409), 2712 Electric Fields (2411), 2736 Magnetosphere/Ionosphere Interactions, 2752 Mhd Waves And Instabilities
Scientific paper
Alfven waves carrying Poynting flux bounce back and forth between the generator, the acceleration region and the ionosphere. In dynamic cases, Alfven waves play an important role in supplying energy to accelerate auroral particles for discrete aurora. By analyzing the development and maintenance of parallel potential, and calculating the required energy supply and release into the acceleration region in the entire auroral current system, necessary conditions for auroral acceleration are determined. The conditions pose constraints for models of auroral particle acceleration. The nonlinear interaction of Alfven waves and kinetic responses to Alfvenic perturbations can both lead to the formation of such a parallel electric field. However, the energy conversion and release for the acceleration of ions and electrons due to the nonlinear interaction of Alfvén waves can lead to strong parallel electric fields and acceleration of nearly monoenergetic electrons on scales of 1 km or less while that due to dispersive Alfven waves produce lower energy, velocity-dispersed electrons on scales the order of 10 km. This presentation concentrates on emphasizing the role of the nonlinear interaction of Alfvén waves including the role of the localized break down of the frozen-in condition in auroral particle acceleration.
Lysak Robert L.
Song Yushu
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