Physics
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.2857s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 24, p. 2857-2860
Physics
92
Lightning, Luminescence, Upper Atmosphere, Video Data, All Sky Photography, Cameras, Electric Discharges, Electrochemistry
Scientific paper
Short-duration upper atmospheric optical flashes were recorded on the night of 8 July, 1993 (9 July UT) from the NASA DC-8 Airborne Laboratory flying over the American Midwest. All-sky video images from an intensified silicon intensified target (ISIT) camera revealed 19 upper atmospheric flashes occurring over a period of approximately 100 min. The flashes were similar in appearance to previously reported ground and shuttle-based video observations. Detailed analysis of 12 of the events yielded these parameters: (1) duration less than or equal to 17 ms; (2) brightness 10-50 kR, roughly that of bright aurorae; (3) terminal heights 30-100 km, with a mean of approximately 60 km; (4) horizontal extent 10-50 km; (5) emission volumes greater than 1000 cu km. The relative frequency of the optical flashes was (6) 1:200-1:400 compared to negative cloud-to-ground discharges and 1:20-1:40 compared to positive cloud-to-ground discharges.
Sentman Davis D.
Wescott Eugene M.
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