The galactic radio source DR 21 at 3.3 mm.
High intensity small diameter radio source DR 21 in Cygnus X thermal radio source complex, discussing flux and consistency with model
Epstein, E. E.↗
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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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Satellite observations of solar radio bursts.
Advanced Technology Satellite /ATS 2/ observations of solar radio bursts during radio noise measurement experiment from above ionosphere
Alexander, J. K.↗
Discovery of hydroxyl radio emission from infrared stars.
Hydroxyl radical radio spectral line emission from IR stars detected by radio telescope
Barrett, A. H.↗
Radio and optical observations of the Hercules Cluster of galaxies.
Radio and optical counts compared for galaxies in Hercules Cluster, noting unresolved radio source at optical center
Carr, T. D.↗
Large-sized orbiting radio telescopes.
Orbiting radio telescope for cosmic radio wave frequency and amplitude detection
Schuerch, H.↗
A long wave radio astronomy interferometer for orbit.
Long wave radio astronomy interferometer system design for orbiting spacecraft, noting radio source surveys and sun and Jupiter observations
Nilson, M. C.↗
Radio relay system performance in an interference environment
Radio frequency interference and performance of terrestrial and satellite radio relay systems
Reinhart, E. E.↗
Ionospheres and radio physics
Ionospheres, radio propagation, and radio physics data - 1967
Bauer, S. J.↗
Direction of arrival of HF radio waves deduced from ionospheric electron content gradients.
Ionospheric electron content gradients from Faraday rotation observations of radio beacon satellites for direction finding of HF radio waves
Narayana Rao, N.↗
The spectrum of the cosmic radio background between 0.4 and 6.5 MHz.
Cosmic radio background noise spectrum near north galactic pole based on Radio Astronomy Explorer satellite experiments
Alexander, J. K.↗
Spectrographic observations of six radio sources
Radio sources spectroscopy, discussing central density and mass of elliptical galaxy NGC 3998 and red shifts of radio galaxies
Demoulin, M.-H.↗
The neutral atmosphere of Venus as studied with the Mariner V radio occultation experiments
Venus atmosphere determinations by Mariner 5 radio occultation measurements, deriving altitude profiles of refractivity, molecular number density, pressure, temperature and radio frequency absorption
Eshleman, V. R.↗
A discussion of the ground-based radio observations
It is reasserted that the Gum nebula is not a single nebula but appears to be composed of several different entities. All the surveys of the southern sky in the continuum, recombination line, H I, and OH were considered. The large amount of high frequency radio emission from the small nebula is noted. The outer part of the Gum nebula has not been seen in any radio observations so far. Only the inner part has been observed to date. It is not justifiable to work out any parameters for the whole nebula by taking an average over the whole solid angle subtended by the big nebula. There appears to be a large difference in density between the small nebula and the big one.
Kerr, F. J.↗
Probing the solar plasma with Mariner radio tracking data
The range and Doppler radio tracking close to the sun made it possible to measure solar plasma dynamics. These were measured by means of a method known as differenced range versus integrated Doppler, which exploits the opposite change of group and phase velocity as the plasma density changes along the radio raypath. A simple solar plasma propagation model is proposed.
Macdoran, P. F.↗
Application of new radio tracking data types to critical spacecraft navigation problems
Earth-based radio tracking data types are considered, which involve simultaneous or nearly simultaneous spacecraft tracking from widely separated tracking stations. These data types are conventional tracking instrumentation analogs of the very long baseline interferometry (VLBI) of radio astronomy-hence the name quasi-VLBI. A preliminary analysis of quasi-VLBI is presented using simplified tracking data models. The results of accuracy analyses are presented for a representative mission, Viking 1975. The results indicate that, contingent on projected tracking system accuracy, quasi-VLBI can be expected to significantly improve navigation performance over that expected from conventional tracking data types.
Ondrasik, V. J.↗
Instrumentation for radio astronomy measurements aboard the IMP-I spacecraft
The design considerations and performance parameters of a satellite-borne instrumentation system are discussed. The system is designed to make radio astronomy measurements at eight discrete frequencies from 50 kHz to 3.53 MHz. These measurements are to detect solar and Jovian radio frequency bursts and to determine the average cosmic background radiation level down to 50 kHz. Procedures used for preflight and inflight calibration of the radiometer and the ground support equipment used for preflight testing are described.
Haddock, F. T.↗
Almucantar radio telescope report 1: A preliminary study of the capabilities of large partially steerable paraboloidal antennas
The almucantar radio telescope development and characteristics are presented. The radio telescope consists of a paraboloidal reflector free to rotate in azimuth but limited in altitude between two fixed angles from the zenith. The fixed angles are designed to provide the capability where sources lying between two small circles parallel with the horizon (almucantars) are accessible at any one instant. Basic geometrical considerations in the almucantar design are presented. The capabilities of the almucantar telescope for source counting and for monitoring which are essential to a resolution of the cosmological problem are described.
Usher, P. D.↗