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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 19 records
All sourcesNASA NTRSDOE OSTI
NASA NTRS1975

Ionospheric effects of X-ray source Scorpius XR-1

A simple two-ion model was employed to evaluate the ionospheric effects of various nocturnal ionization sources. The model was used to calculate the decay of the electron number density at 90 km with and without illumination by Scorpius XR-1 X rays. Reflection parameters for the determination of the effect of cosmic x-ray sources on radio wave propagation were also obtained. The results obtained in the investigation do not support the proposal made by Anathakrishnan and Ramanathan (1969) that the X-ray source in Scorpius XR-1 affects the nighttime lower ionosphere of the earth.

Poppoff, I. G.↗
NASA NTRS1973

Long-term X-ray observations of Scorpius X-1 by OSO-III.

Review of the observations of Scorpius X-1 in the energy range 7.7-22 keV provided by the X-ray telescope on the OSO-III satellite over the period from May 19 to June 13, 1967. Optical observations representative of the full range of temporal behavior of the source are available on 10 nights during this period. Sco X-1, in spite of being the most extensively observed X-ray source, remains one of the least understood. Coordinated observations in various wavelength bands, although inconclusive so far, represent potentially the most fruitful approach.

Pelling, R. M.↗
NASA NTRS1975

Results of X-ray and optical monitoring of Scorpius X-1 in 1970

Scorpius X-1 was monitored at optical and X-ray wavelengths from 1970 April 26 to 1970 May 20. The optical observations were made at six observatories around the world, and the X-ray observations were made by the Vela satellites. There was a tendency for the object to show greater variability in X-ray emission when the object was optically bright. The intensity histograms for both the optical and X-ray observations are discussed, as well as periodic variations in the optical intensity.

Mook, D. E.↗