Physics – Plasma Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm33a2141d&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SM33A-2141
Physics
Plasma Physics
[2704] Magnetospheric Physics / Auroral Phenomena, [2753] Magnetospheric Physics / Numerical Modeling, [7827] Space Plasma Physics / Kinetic And Mhd Theory, [7867] Space Plasma Physics / Wave/Particle Interactions
Scientific paper
Electron acceleration in global standing Alfven modes (also known as Field Line Resonances) leads to the formation of some auroral arcs and recent analysis of auroral turbulence suggests that large scale waves couple energy to smaller scale lengths on the order of the electron inertial and ion gyro-radius scale lengths. Self-consistent hybrid MHD kinetic electron simulations have been used to study the upward current region of these waves. As with observations, a cross scale coupling from global to dispersive perpendicular scale lengths is evident in these simulations. Mirror force trapping of electrons was found to lead to enhanced parallel electric fields since the un-trapped electron population must be accelerated to a greater extent in order to carry the field aligned current. These current carrying electrons are additionally sourced from all along the field line and the simulations have also illustrated an interesting coherence in both the energization and the time history of the electrons that form the current carrying distribution. This coherence is linked to the interaction of the electron bounce dynamics in the dipolar magnetic field with the accelerating potential of the wave. In this presentation, we will summarize the details of this structuring and analyze how the particle bounce dynamics is affecting the evolution of the resonance system.
Damiano Peter A.
Johnson Jesse
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