Flickering aurora studies using high speed cameras

Details Flickering aurora studies using high speed cameras Flickering aurora studies using high speed cameras

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm41a1694m&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM41A-1694

Physics

[0310] Atmospheric Composition And Structure / Airglow And Aurora, [2407] Ionosphere / Auroral Ionosphere

Scientific paper

We report on observations of flickering aurora using two different digital camera systems. The first, a high speed Phantom 7 camera with a Video Scope HS 1845 HS image intensifier coupled with an 50mm lens provides fast frame rates with data recorded at 200 and 400 frames per second with a 512x384 pixel, 11.8x8.8 degree FOV. The second system is an Andor Electron-Multiplying Charge Couple Device (EMCCD) running at 33 frames per second using a 256 by 256 format covering 16x16 degrees field of view. Both systems made observations of flickering aurora in the magnetic zenith, using optical filters transmitting the prompt blue and red emissions of nitrogen. The Andor system was deployed at the Poker Flat rocket range near Fairbanks AK, while the Phantom system was deployed approximately 400 miles north of Poker Flat at Toolik Lake observatory. We find both narrow band low frequency (~5-10 Hz) and wider band, higher frequency (50- 70 Hz) oscillations in the optical intensity of flickering aurora. Direct comparison of the optical data and the dispersion relation for ion cyclotron waves thought to be responsible for the modulation of electrons causing the intensity fluctuations seen in flickering aurora are presented.

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