Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apopt..16..756b&link_type=abstract
Applied Optics, vol. 16, Mar. 1977, p. 756-763.
Astronomy and Astrophysics
Astronomy
4
Far Ultraviolet Radiation, Helium Ions, Interplanetary Space, Spaceborne Astronomy, Ultraviolet Photometry, Apollo Soyuz Test Project, Cosmic Plasma, Plasmapause
Scientific paper
A 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.
Bowyer Stuart
Freeman John J.
Lampton Michael
Paresce Francesco
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