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Extreme ultraviolet photometer for observations of helium in interplanetary spaceA four-channel photometer sensitive to two solar EUV lines which are resonantly scattered by helium gas was developed for flight on the Apollo-Soyuz Test Project. Two channels observed the 58.4-nm line of He I and used helium gas resonant absorption cells to determine the intensities of the center and wings of that line. The other two channels observed the 30.4-nm line of He II. The instrument surveyed much of the celestial sphere during a series of slow rolling maneuvers by the Apollo spacecraft. The experiment operated properly, and usable data were obtained. Study of the distributions of flux seen, and of the ratio 58.4-nm fluxes seen with gas cells full and empty, will refine current understanding of several poorly known properties of the local interstellar medium. Study of the 30.4-nm flux distribution will refine present knowledge of the structure of the earth's plasmasphere.
Document ID
19770042401
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bowyer, S.
(California Univ. Berkeley, CA, United States)
Freeman, J.
(California Univ. Berkeley, CA, United States)
Paresce, F.
(California Univ. Berkeley, CA, United States)
Lampton, M.
(California, University Berkeley, Calif., United States)
Date Acquired
August 8, 2013
Publication Date
March 1, 1977
Publication Information
Publication: Applied Optics
Volume: 16
Subject Category
Spacecraft Instrumentation
Accession Number
77A25253
Funding Number(s)
CONTRACT_GRANT: NAS9-13807
Distribution Limits
Public
Copyright
Other

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