Indication for circular organization of column sprite elements associated with Eastern Mediterranean winter thunderstorms

Details Indication for circular organization of column sprite elements associated with Eastern Mediterranean winter thunderstorms Indication for circular organization of column sprite elements associated with Eastern Mediterranean winter thunderstorms

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jastp..71.1835v&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 71, Issue 17-18, p. 1835-1839.

Physics

5

Columniform Sprites, Winter Thunderstorms, Optical Observations

Scientific paper

We report synchronized optical observations of sprites in Israel during the winters of 2006/7-2007/8. Based on several events, we suggest that the elements of columniform sprites are organized in spaced intervals on the circumference of a circle centered directly above, or a little offset, to the vertical direction from the parent lightning. In 2D images most of the cases show columns to be arranged in highly eccentric elliptical forms or in straight rows. The analysis of the optical images provided the geometrical dimensions of the columns and their spatial organization. We used an electrostatic model of the QE field with reasonable assumptions on the location and magnitude of the cloud charge center, constrained by ELF evaluation of the Charge Moment Change in the parent flash, to show that the observed diameter of the columnar arrangement closely matches the conventional breakdown field line contour at the same altitude.

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