Accession Number : AD0717695

Title :   Spectroscopic Studies of Barium Releases.

Descriptive Note : Environmental research papers,

Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS

Personal Author(s) : Best,Gordon T. ; Rosenberg,Norman W.

Report Date : 12 NOV 1970

Pagination or Media Count : 22

Abstract : Optical observations following the release of barium vapor at high altitudes can be described in terms of three phases. The first, lasting of the order of a second, is the initial release and expansion of a neutral barium cloud. The second is the ionization phase that can take from 3 to 100 sec, depending on release altitude and size. The remaining history is characterized by the development of striations in the ion cloud and of a tail joining the ion and neutral clouds. Observations of each of the above phases with various optical instruments showed the ionization mechanism to be vvia metastable levels, and experiments were conducted which led to a more detailed description of the processes involved. (Author)

Descriptors :   (*ATMOSPHERIC SOUNDING, UPPER ATMOSPHERE), (*CONDENSATION TRAILS, SPECTROSCOPY), BARIUM, PLASMA MEDIUM, RADIOFREQUENCY INTERFERENCE, IONIZATION, TRACER STUDIES, ATMOSPHERIC MOTION, ULTRAVIOLET SPECTROSCOPY

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE