Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm52b..11s&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM52B-11
Physics
2451 Particle Acceleration, 2704 Auroral Phenomena (2407), 2752 Mhd Waves And Instabilities, 2764 Plasma Sheet
Scientific paper
Alfven waves carrying Poynting flux play an important role in the electromagnetic coupling of plasma sheet activity with the high latitude ionosphere. Thus, the generation of Alfven waves and the divergence of the Poynting flux become key questions in understanding the plasma sheet electromagnetic coupling. The generation of Alfven waves and its relationship with bursty bulk flows (BBF) will be discussed in terms of MHD wave mode conversion during a localized breakdown of the frozen-in condition. This process leads to the transfer of energy between kinetic, thermal and electromagnetic energy. Localized reconnection processes play a critical role in this energy transfer. By analyzing the dynamical conditions required for the generation of Alfven waves, such as energy supply, torques and twist helicity, the cause-effect relationship of the generation of Alfven waves, reconnection, and BBF will be discussed. The establishment of a parallel electric field and potential drop are necessary for particle acceleration. A reduced perpendicular vortex motion of the Alfven waves accompanied with an enhanced twisted magnetic field of the Alfven waves correspond to particle acceleration, while an enhanced vortex motion with reduced twist in the magnetic field leads to the formation of the charge holes. The nonlinear interaction of Alfvén 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 while that due to dispersive Alfven waves produces lower energy, velocity-dispersed electrons.
Lysak Robert L.
Song Yushu
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