Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm32a..06s&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM32A-06
Physics
2704 Auroral Phenomena (2407), 2712 Electric Fields (2411), 2716 Energetic Particles, Precipitating, 2752 Mhd Waves And Instabilities, 7827 Kinetic And Mhd Theory
Scientific paper
Alfven waves carrying Poynting flux play an important role in supplying energy to accelerate auroral particles. In general, the energy supply depends on the interaction of the generator, the ionosphere and the acceleration region. Energy calculations for a quasi-steady model and for a linearized dispersive Alfven wave model, however, show that the available energies supporting the auroral particle acceleration are often not sufficient for the narrow arc formation, implying that some nonlinear dynamical processes are needed to explain the narrow arc formation. The establishment of a parallel potential drop and parallel electric field is necessary for particle acceleration and the formation of the charge holes. A reduction in the perpendicular vortex motion of the Alfven wave packet accompanied by an enhancement in the twisted magnetic field of the Alfven wave packet corresponds to particle acceleration, while an enhanced vortex motion with reduced twist in the magnetic field leads to the formation of the charge holes. By calculating the required temporal change and spatial distribution of the perpendicular vortex motion and magnetic twist helicity for the whole auroral current system including the generator, we propose that the nonlinear interaction of Alfven wave packets including kinetic responses to Alfvenic perturbations can lead to the formation of such a parallel potential drop and parallel electric field. A localized breakdown of the frozen-in condition is necessary in the non-linear interaction of Alfven wave packets.
Lysak Robert L.
Song Yushu
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