Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm23b..05s&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM23B-05
Physics
2455 Particle Precipitation, 2704 Auroral Phenomena (2407), 2716 Energetic Particles: Precipitating, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2794 Instruments And Techniques
Scientific paper
Alfvén waves propagating obliquely to the Earth's magnetic lines of force become dispersive when the perpendicular wavelength approaches the collisionless electron skin depth. The dispersion results in two simultaneous effects: (1) wave energy becomes coupled to particle kinetic energy such that parallel acceleration of electrons is possible, and (2) wave energy spreads azimuthally across the background magnetic field, with phase- and group-velocities oppositely directed. Validation of this mechanism requires two-dimensional, time-dependent measurements of the dispersing wave packet. Such evidence should be available in video measurements of the aurora-borealis. An analysis of high-speed, narrow-field, intensified video of dynamic aurora event is presented, confirming the salient predictions for inertial Alfvén wave dispersion.
Blixt M.
Semeter Joshua
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