Studies of the extreme ultraviolet/soft X-ray background

Details Studies of the extreme ultraviolet/soft X-ray background Studies of the extreme ultraviolet/soft X-ray background

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978phdt........13s&link_type=abstract

Ph.D. Thesis California Univ., Berkeley.

Astronomy and Astrophysics

Astronomy

Apollo Soyuz Test Project, Background Radiation, Sky Radiation, Ultraviolet Radiation, X Rays, Interstellar Space, Plasmas (Physics), Sky Surveys (Astronomy), Telescopes, Thermal Emission

Scientific paper

With a primary field-of-view of 2.3 plus or minus 0.1 deg FWHM and four EUV bandpass filters (16-25, 20-73, 80-108, and 80-250 eV) a focusing telescope made an extensive sky survey of the extreme ultraviolet (EUV)/soft X-ray background as part of the Apollo-Soyuz mission. Analysis of the data reveals an intense flux above 80 eV energy, with upper limits to the background intensity given for the lower energy filters (approximately 20,000 and 600 ph/sq cm/sec/ster/eV at 21 and 45 eV respectively). The uniformity of the background flux is uncertain due to limitations in the statistical accuracy of the data. Severe constraints are placed on models for the origin of the EUV background based upon various classes of unresolved point sources, increasing the likelihood that the EUV/soft X-ray background is probably the result of emission from hot plasma in the interstellar medium.

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