High Time Resolution Telescopic Imaging of Fine Structure in Sprites

Details High Time Resolution Telescopic Imaging of Fine Structure in Sprites High Time Resolution Telescopic Imaging of Fine Structure in Sprites

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmae51a..09m&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #AE51A-09

Other

3324 Lightning, 3334 Middle Atmosphere Dynamics (0341, 0342), 3394 Instruments And Techniques, 3304 Atmospheric Electricity

Scientific paper

Experimental documentation of the dynamics of streamer formation and propagation is crucially important for a complete understanding of sprites and their effects on the mesosphere and the lower ionosphere. In July and August 2004, sprites were observed from Langmuir Laboratory using a 1000+ frames-per-second CCD imager mounted to a Dobsonian telescope. Additionally, photometer data was recorded using an array of six photometers with 40 us resolution, and broadband ELF and VLF data was recorded at multiple locations. We present telescopic video observations of sprites at high frame rates, demonstrating very complex structures in both space and time, including bead and streamer formation and propagation. Comparisons show that beads are seen to often propagate at much slower speeds than streamers, and at other times are static, while streamers often propagate at velocities on the order of one-tenth the speed of light. Streamers that appear and disappear within a single frame (i.e., 1 ms), with lateral sizes often in the range of tens of meters are documented. Streamers rarely persist for more than 1-2 ms, while beads persist up to tens of ms and often propagate at slow speeds. Additionally, images show that streamers are often made up of many bead-like structures. Photometer data and ELF/VLF data are also presented, as evidence for sprite halos and early/fast events associated with sprites.

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