The Search for Extraterrestrial Intelligence, SETIPhilip Morrison, John Billingham, John Wolfe National Aeronautics and Space Administration, Scientific and Technical Information Office, 1977 - 276 páginas |
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Página 21
... flux level and over as wide a frequency band as practicable . ( See Sections II - 5 and III - 3 . ) To be significant , a full sky survey should be able to detect coherent radiation at a flux level one or two orders of magnitude below ...
... flux level and over as wide a frequency band as practicable . ( See Sections II - 5 and III - 3 . ) To be significant , a full sky survey should be able to detect coherent radiation at a flux level one or two orders of magnitude below ...
Página 79
... flux levels by radio astronomical standards . The Parkes 2700 - MHz source survey of the sky visible from Australia employed a bandwidth of 200 MHz and a sensitivity such that a signal flux level of about 1020 W / m2 would have produced ...
... flux levels by radio astronomical standards . The Parkes 2700 - MHz source survey of the sky visible from Australia employed a bandwidth of 200 MHz and a sensitivity such that a signal flux level of about 1020 W / m2 would have produced ...
Página 86
... flux level , direction , and frequency . In Section III - 3 an elegant theorem is developed 86.
... flux level , direction , and frequency . In Section III - 3 an elegant theorem is developed 86.
Página 87
... flux level attainable using an ideal receiver in the real universe and compare its performance with that of a state - of - the - art receiver . This expression is : Фо = 4πm / 2 t ( W / m2 ) ( 1 ) where the flux density , ( 6 ) varies ...
... flux level attainable using an ideal receiver in the real universe and compare its performance with that of a state - of - the - art receiver . This expression is : Фо = 4πm / 2 t ( W / m2 ) ( 1 ) where the flux density , ( 6 ) varies ...
Página 88
... flux levels , spatial and frequency resolutions . The resulting astronomical data would be valuable , and it does not seem unduly optimistic to expect new discoveries in the spectral line domain , independent of precise frequency ...
... flux levels , spatial and frequency resolutions . The resulting astronomical data would be valuable , and it does not seem unduly optimistic to expect new discoveries in the spectral line domain , independent of precise frequency ...
Otras ediciones - Ver todas
The Search for Extraterrestrial Intelligence, SETI Philip Morrison,John Billingham,John Wolfe Vista completa - 1977 |
The Search for Extraterrestrial Intelligence, SETI Philip Morrison,John Billingham,John Wolfe Vista completa - 1977 |
The Search for Extraterrestrial Intelligence, SETI Philip Morrison,John Billingham,John Wolfe Vista completa - 1977 |
Términos y frases comunes
Ames Research Center antenna Arecibo array astrometric bandwidth beam biological capabilities CETI clouds collecting area COMPLEMENTARY DOCUMENT cosmic cost cultural density detection direction distance Earth Earth-based electromagnetic emission energy extraterrestrial civilizations extraterrestrial intelligence factors flux level frequency band galactic Galaxy ground-based hydrogen interstellar communication interstellar medium interstellar search Jesse Greenstein Jet Propulsion Laboratory main sequence maser microwave window NASA noise observations Observatory optimum orbit Philip Morrison planetary systems planets polarization possible present problem Project Cyclops pulsars pulse radar radial velocity radiation radio astronomy radio frequency interference radio telescopes range received resolution satellite Science Workshop scientific search for extraterrestrial search for signals search strategy search system Section sensitivity SETI Program Office SETI system signals from extraterrestrial solar system sources space species spectral type spectrum star formation stellar studies techniques temperature terrestrial transmitters University W/m² water hole wavelength