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The multiwavelength behaviour of BL Lacertae explained by a wiggling filamentary jet
Raiteri C.
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Diversions of a radio telescope
Notes and Records of the Royal Society, 2008The first use of the 250-foot radio telescope at Jodrell Bank, an instrument designed for academic research, was as a radar, when it obtained echoes from the rocket launcher of Sputnik 1 in October 1957. It was soon realized that this was the only radar system capable of detecting intercontinental missiles soon after their launch from within the USSR ...
Sir Bernard Lovell +1 more
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Radio Science, 1977
Observations of extraterrestrial radio sources at the lower end of the radio frequency spectrum are limited by reflection of waves from the topside ionosphere and by the large size of antenna apertures necessary for the realization of narrow beamwidths. The use of the ionosphere as a lens is considered.
Paul A. Bernhardt, A. V. Da Rosa
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Observations of extraterrestrial radio sources at the lower end of the radio frequency spectrum are limited by reflection of waves from the topside ionosphere and by the large size of antenna apertures necessary for the realization of narrow beamwidths. The use of the ionosphere as a lens is considered.
Paul A. Bernhardt, A. V. Da Rosa
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2013
© Springer Science+Business Media Dordrecht 2013.Radio Telescopes starts with a brief historical introduction from Jansky’s1931 discovery of radio emission from the Milky Way through the development ofradio telescope dishes and arrays to aperture synthesis imaging.
Ekers, Ronald, Wilson, T.
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© Springer Science+Business Media Dordrecht 2013.Radio Telescopes starts with a brief historical introduction from Jansky’s1931 discovery of radio emission from the Milky Way through the development ofradio telescope dishes and arrays to aperture synthesis imaging.
Ekers, Ronald, Wilson, T.
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The Australian radio-telescope
Astrophysics and Space Science, 1986A large synthesis radio telescope is under construction in Australia at a cost of $A 30.7million. In comprises a 6 km-long ‘compact array’ of 22 m antenna at Culgoora and a ‘long baseline array’ of 319 km, achieved by adding another 22 m antenna near Coonabarabran and the existing 64 m antennae at Parkes.
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Radio Astronomy and Radio Telescopes
2010An astronomical object somewhere in the Planetary System, the Galaxy, a Cluster of Galaxies, or far out in the Universe may generate radio waves by one or the other physical process (a topic of Astrophysics). If the radio emission is generated inside the object, some of the radio waves propagate through the object until they may leave the radio source ...
Michael Bremer, Albert Greve
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2007
The Square Kilometer Array (SKA) may yet become the world’s largest radio telescope, consisting of thousands of antennas (both dishes and dipoles) spread over isolated, semi-desert regions of South Africa and Australia.
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The Square Kilometer Array (SKA) may yet become the world’s largest radio telescope, consisting of thousands of antennas (both dishes and dipoles) spread over isolated, semi-desert regions of South Africa and Australia.
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Science News, 1969
In the last 30 years radio telescopes have given astronomers an entirely new picture of the universe. Radio astronomy has a distinguished record of discovering things not only unknown, but unsuspected. The record stretches from the original discovery in the 1930's that astronomical objects gave off radio waves (SNL: 6/3/33, p.
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In the last 30 years radio telescopes have given astronomers an entirely new picture of the universe. Radio astronomy has a distinguished record of discovering things not only unknown, but unsuspected. The record stretches from the original discovery in the 1930's that astronomical objects gave off radio waves (SNL: 6/3/33, p.
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Radio telescope for millimeter wavelengths.
Journal of Spacecraft and Rockets, 1964A 16-ft-diam radio telescope has been built to operate at frequencies up to 140 Gc (2.15-mm wavelength). The expected gain at 140 Gc is 72.5 db. Measured gain at 70 Gc is greater than 67.8 db with a beamwidth of 3.7 min of arc. The parabolic reflector comprises Invar honeycomb panels supported by a welded Invar truss; its surface is precision-swept ...
R. C. Fisher, H. S. Hoard, F. A. Onians
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Prism beamswitch for radio telescopes
Review of Scientific Instruments, 1978A dielectric prism and switching mechanism have been constructed for beamswitching a Cassegrain radio telescope. Spatially extended radio sources may be mapped without significant confusion utilizing the sensitivity and stability inherent in the conventional Dicke radiometer.
J. M. Payne, B. L. Ulich
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