Imaging of elves, halos and sprite initiation at 1ms time resolution

Details Imaging of elves, halos and sprite initiation at 1ms time resolution Imaging of elves, halos and sprite initiation at 1ms time resolution

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jastp..65..509m&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 65, Issue 5, p. 509-518.

Physics

34

Scientific paper

Elves, halos and sprites were observed during August 1999 with a 1ms high speed imager. The higher time resolution compared to conventional television cameras (17 or 20ms) allowed excellent images of the three phenomena temporally separate from each other to be obtained. Analysis of images of elves and halos indicates that the causal lightning-generated electromagnetic pulse and quasi-electro static fields are homogeneous and any small-scale (sub-10km) structure, if visible, is most likely due to a structured atmosphere. Observations of sprites initiated to the side of a halo, without a halo, and from beads left over from a previous sprite, respectively, all suggest sub-pixel (<0.5km) background structures in atmospheric pressure or composition as being the dominant factors in determining the sprite ``seed'' location, or site of sprite initiation.

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