Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsm54a..02s&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SM54A-02
Physics
2704 Auroral Phenomena (2407), 2716 Energetic Particles: Precipitating, 2736 Magnetosphere/Ionosphere Interactions (2431), 2752 Mhd Waves And Instabilities (2149, 6050, 7836)
Scientific paper
The dispersion of inertial-scale Alfven waves in the near-Earth magnetosphere produces field-aligned electron populations with sufficient energy to excite the optical aurora. In these cases, luminous structure should reflect structure in the overlying wave field, thus providing a framework for comparison of auroral imagery with laboratory measurements of Alfven wave dispersion. The challenge lies in collecting images at sufficient cadence and resolution. An analysis of narrow-field video recorded at 50 images/s has revealed two distinct motions in dynamic aurora: a group motion associated with a translating wave packet, and a phase motion associated with the periodic substructure. The latter appears to be consistent with a standing wave pattern. Our working hypothesis is that these ephemeral field patterns result from a rapid drift between the wave source and the background plasma, which would produce Airy-like patterns in the auroral fine structure.
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