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Photography of a lithium vapor trail during the daytime.Barium and lithium vapors were released from sounding rockets in the thermosphere and observed from aboard a jet aircraft at an altitude of 40,000 ft. The purpose of the releases was to demonstrate the feasibility of an all-weather technique for observing chemical releases and to evaluate methods of observing daytime releases. The selected flight plan of the aircraft allowed a series of observations of the trail from two different straight line paths. Data were recorded photographically. The reduction in sky brightness at the 40,000-ft altitude as compared to the ground allows the use of a filter with a 10-A bandwidth for trail photography in the daytime. These photographs verified the calculation of the usable angular field of the narrow-band filters. Photographs of a 45-min-old trail of lithium vapor were obtained up to 20 min after sunrise at the aircraft. It is concluded that now vapor trail observations may be made during the daytime without regard to weather and logistic restrictions.
Document ID
19730035266
Document Type
Reprint (Version printed in journal)
Authors
Bedinger, J. F. (GCA Corp. GCA Technology Div., Bedford, Mass., United States)
Date Acquired
August 7, 2013
Publication Date
February 1, 1973
Publication Information
Publication: Journal of Atmospheric and Terrestrial Physics
Volume: 35
Subject Category
GEOPHYSICS
Distribution Limits
Public
Copyright
Other