A two-dimensional particle-code simulation of inertial Alfven waves and auroral electron acceleration

Details A two-dimensional particle-code simulation of inertial Alfven waves and auroral electron acceleration A two-dimensional particle-code simulation of inertial Alfven waves and auroral electron acceleration

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm31b0314s&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM31B-0314

Physics

2704 Auroral Phenomena (2407), 2716 Energetic Particles: Precipitating, 2753 Numerical Modeling, 7829 Kinetic Waves And Instabilities

Scientific paper

A two-dimensional particle code used to simulate the propagation of inertial Alfven waves and acceleration of electrons down auroral field lines. The simulation domain is 20,000 km parallel to the magnetic field and some tens of km perpendicular to the field. Electrons are tied to the magnetic field. Effects of a variable magnetic field and magnetic mirror force are included. A spatially narrow Alfven pulse is launched by application of a time and distance varying potential at the top of the simulation domain. If the thickness of the pulse is less than the electron inertial length, the pulse tends to broaden as it propagates down the field line. The downward acceleration was strongest when the applied excitation consisted of a moving positive pulse followed by a negative pulse. Strongest upward acceleration was seen when the polarity was reversed. The strongest interactions between the electrons and the Alfven wave occurs in the 3000 to 7000 km altitude range. A fraction of the electrons were accelerated to 1.5 keV with a peak magnitude of the driving potential of 200V.

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