Kinetic Simulation of Alfvén Waves with Small Transverse Scale

Details Kinetic Simulation of Alfvén Waves with Small Transverse Scale Kinetic Simulation of Alfvén Waves with Small Transverse Scale

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm21b0551t&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM21B-0551

Physics

2704 Auroral Phenomena (2407)

Scientific paper

Recent observations (FREJA, FAST, POLAR) show that Alfvén waves of small transverse scale are present in regions of the auroral ionosphere where strong acceleration of energetic ions and electrons results. In this study computer simulation is used to explore the self-consistent, kinetic behavior of these Alfvén waves through selected cases. An electromagnetic PIC code is used to study Alfvén waves which are excited at a boundary and propagate along the geomagnetic field. A comparison is made between cases with a single perpendicular wave number and cases with finite structures that give rise to field-aligned current filaments. The transition between the inertial and kinetic regimes is explored as well as the modifications produced by hot ions. Some nonlinear cases are also explored by systematically increasing the excitation amplitude of the antenna. This work is sponsored by NSF.

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