Intensity, Duration and Motion of Auroral Arcs: Case Studies and Survey

Details Intensity, Duration and Motion of Auroral Arcs: Case Studies and Survey Intensity, Duration and Motion of Auroral Arcs: Case Studies and Survey

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm13a1644t&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM13A-1644

Physics

2704 Auroral Phenomena (2407), 2716 Energetic Particles: Precipitating, 2736 Magnetosphere/Ionosphere Interactions (2431)

Scientific paper

Auroral arcs are investigated in the two dominant visible wavelengths (5581 Å and 6304 Å) using images from the all-sky camera in Gillam, Canada - part of the NORSTAR array. With the use of cross sections drawn across the arcs, both the brightness and latitudinal movement are plotted over time with a time resolution of 10 seconds. First, the actual meridional velocities of the arcs are evaluated by converting pixel coordinates in the fisheye perspective of the camera to true latitudinal coordinates. From the mapping of arc movements, examples of almost non-moving arcs with lifetimes of more than 10 minutes have been given in support of the Stationary Inertial Alfvén Wave Model [Knudsen, SSR 2001] which could explain some auroral structures. Second, a statistical survey suggests that the brightness of arcs is directly proportional to their duration. The stronger brightness is directly related to higher precipitating-electron energy flux that in turn depends on the magnetotail configuration. We will report on the variation of the auroral intensity as a function of magnetotail configuration (stretched or dipolar) based on a comparison with magnetic field measurements provided by NOAA's Geosynchronous Operational Environmental Satellite (GOES-12).

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