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Topic: Radio astronomy

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  Radio astronomy - Wikipedia, the free encyclopedia
Radio astronomy is the study of celestial phenomena through measurement of the characteristics of radio waves emitted by physical processes occurring in space.
Radio astronomy has led to substantial increases in astronomical knowledge, particularly with the discovery of several classes of new objects, including pulsars, quasars and radio galaxies.
Radio astronomy is also partly responsible for the idea that dark matter is an important component of our universe; radio measurements of the rotation of galaxies suggest that there is much more mass in galaxies than has been directly observed (see Vera Rubin).
en.wikipedia.org /wiki/Radio_astronomy   (849 words)

 Radio Astronomy [encyclopedia]   (Site not responding. Last check: 2007-10-07)
Radio Astronomy is the study of the Universe and astrophysical phenomena, by examining their emission of electromagnetic radiation in the radio portion of the spectrum.
Radio astronomy has greatly improved our understanding of the evolution of stars, the structure of galaxies, and the origin of the universe.
The low-frequency limit of the radio band is determined by the opacity of the ionosphere, while the high-frequency limit is due to strong absorption from oxygen and water bands in the lower atmosphere.
kosmoi.com /Science/Astronomy/Radio   (1001 words)

 ORBSEARCH.COM | encyclopedia of knowledge
Radio astronomy is a relatively new field of astronomical research.
Following World War II, substantial improvements in radio astronomy technology were made by astronomers in Europe and the United States, and the field of radio astronomy began to blossom.
Radio astronomy is also partly responsible for the idea that dark matter is an important component of our universe; radio measurements of the rotation of galaxies suggest that there is much more mass in galaxies than has been directly observed.
www.orbsearch.com /ra/Radio_astronomy.php   (650 words)

 radio astronomy: a project by r a d i o q u a l i a   (Site not responding. Last check: 2007-10-07)
Radio Astronomy is an art and science project which broadcasts sounds intercepted from space live on the internet and on the airwaves.
Radio Astronomy correlates the processes associated with broadcast radio - the transmission of audible information, and the processes of radio astronomy - the observation and analysis of radiated signals from planets, stars and other astrophysical objects.
The project is indeed radio astronomy in the strict sense - a radio station devoted to broadcasting sounds from space.
www.radio-astronomy.net   (1524 words)

 Radio Astronomy
The Mullard Radio Astronomy Observatory is part of the Cavendish Laboratory, the Physics Department of the University of Cambridge.
The Nançay Radio Observatory is a scientific department (the Unité Scientifique de Nançay) of the Observatoire de Paris, and it is also associated to the CNRS (the French National Scientific Research Centre).
The radio telescope at Radio Astronomy at the University of Indianapolis is a 5 meter educational radio telescope.
www.cv.nrao.edu /fits/www/yp_radio.html   (7170 words)

 Astronomy Today: Radio Astronomy
It would seem that the public perception of radio astronomy conjures up images of astronomers in tight jeans wearing headphones to detect some weak signal buried in the galactic noise.
Radio waves having enormous wavelengths by comparison, do not focus into neat "pictures" rather they tend to interfere with one another since the focusing device (reflector) is tiny in relation to the wavelength.
To construct a 10 mm wavelength radio telescope with the imaging capabilities of a small 4 inch optical telescope one would need a reflector about 2 km (over 6000 feet!) in diameter, clearly this enormous size is impractical.
www.astronomytoday.com /astronomy/radioastro.html   (1050 words)

 Radio Astronomy at the University of Indianapolis   (Site not responding. Last check: 2007-10-07)
Radio astronomy is astronomical observation at radio wavelengths.
On 8/9/2004, the declination at which the radio telescope was pointed was changed to -28.85 degrees, which is the declination of SGR A. An observation file commenced at 7 pm EST on that date was the first of this series of observations of SGR A at its declination.
The regular radio astronomy receiver has a passband of 35 MHz, is frequency agile, and was tuned to a center frequency of 3.87 GHz, the low part of C band, where interference is minimized.
radio.uindy.edu /radio   (4090 words)

 Information about radio astronomy.   (Site not responding. Last check: 2007-10-07)
Radio waves are emitted because the fl hole ingests hydrogen gas, along with anything else that comes near it, and the captured material is accelerated and ionized on approach and in the presence of a magnetic field produces radiation at radio frequencies.
When astronomers realized that the new radio telescope could observe radio waves from the center of the galaxy, which was blocked to their optical instruments by clouds of dust, the building of the great radio telescopes began.
A change in the intensity of radio waves is marked by a change in the voltage at the output of the radio astronomy receiver.
radio.uindy.edu /radio/info.htm   (978 words)

 Why Radio Astronomy?   (Site not responding. Last check: 2007-10-07)
Radio astronomy may be conducted using either imaging or non-imaging techniques.
Non-imaging radio astronomy includes the observation of radio noises from Jupiter, collection of solar flare data, and meteor infall counts.
The reason for using the broadband equipment is that discrete radio objects radiate over a large spectrum, therefore a greater receiver bandwidth increases the amount of energy received from the object.
www.bambi.net /sara/why.htm   (421 words)

 Frequently Asked Questions About Radio Astronomy
The National Radio Astronomy Observatory (NRAO) is a facility of the National Science Foundation, operated by Associated Universities, Inc., a nonprofit research organization.
Radio observations as part of a Search for Extraterrestrial Intelligence (SETI) have been done by different groups of researchers for a number of years, but this type of work is not a part of NRAO observational programs.
Amateur radio operators pursue a number of activities that are somewhat related to radio astronomy, including communicating by bouncing radio signals off the Moon and the ionized trails of meteors in the Earth's atmosphere.
www.aoc.nrao.edu /intro/faq.html   (1395 words)

 Brandeis University Radio Astronomy   (Site not responding. Last check: 2007-10-07)
The Brandeis Radio Astronomy Group conducts research in extragalactic astrophysics and cosmology at wavelengths covering the entire electromagnetic spectrum, but especially at radio wavelengths.
These experiments are revealing for the first time the magnetic field structure in these compact objects (where apparent motions in excess of the speed of light are often observed), and the nature of the plasma surrounding the massive fl hole thought to exist at the center of these sources.
The VLA has also been used to make extremely high quality maps of the radio "jets" in many quasars, in order to understand the mechanism by which enormous amounts of energy are transported from the cores to the outer radio lobes.
pc.astro.brandeis.edu   (221 words)

 radio astronomy on Encyclopedia.com
Radio astronomy on the cheap: most of us rely on visible electromagnetic radiation to tell us and our students something about the Cosmos; but sophisticated (and inexpensive) radio observations are now possible and...
On the threshold of Cherenkov astronomy; radiation of extremely high energy from several celestial objects is leading astronomers to extend their science's spectral range yet again.
Physics and astronomy's strange language: hot to befuddle the public.
www.encyclopedia.com /html/r1/radioast.asp   (354 words)

 101 Radio Astronomy - www.101science.com
Radio astronomy is a relatively new science compared to optical astronomy.
The ionosphere which reflects radio waves is a nuisance to radio astronomy.
The radio frequency range of most importance to radio astronomy therefore is approximately from 1 centimeter to 10 meters.
www.101science.com /rastronomy.htm   (1014 words)

 Radio History   (Site not responding. Last check: 2007-10-07)
The early history of radio astronomy begins in 1894, with Sir Oliver Lodge.
The field of radio astronomy would eventually recognize him with a unit named for him; the Jansky is equivalent to 10^(-26) watts per m^2 per Hz.
In 1946, J.S. Hey, S.J. Parsons, and J.W. Phillips observed fluctuations in the intensity of cosmic radio waves from the constellation Cygnus.
web.haystack.mit.edu /education/radiohist.html   (772 words)

 Books by John Kraus - Radio Astronomy   (Site not responding. Last check: 2007-10-07)
This is the way the sky would appear if our eyes were sensitive to radio waves instead of light.
The dots are radio sources but none correspond to any visible star.
Radio source lists, Messier's list, frequency allocations, precession charts and much, much more.
www.cqbooks.com /radastro.htm   (158 words)

Infra-red radiation (green) is emitted by dust clouds warmed by new stars imbedded in the nebula.
The optical light (blue) and radio waves(red) are produced when hot, young stars ionize the gas around them.
While much of the optical light is blocked by foreground dust clouds, the radio radiation streams on through, allowing us to see all of the hot gas.
www.gb.nrao.edu   (199 words)

 Radio Astronomy Telescope Project
Specifically, the study of the radio spectra of these emissions is used to determine the distribution and dynamics of hydrogen throughout our galaxy.
I have been interested in radio astronomy for years but have only recently been able to find the time to assemble my own radio telescope.
It is my hope that this information will be helpful to others who are interested in radio astronomy or who may even be considering a project of their own.
www.signalone.com /radioastronomy/telescope   (1465 words)

 Radio Astronomy Imaging   (Site not responding. Last check: 2007-10-07)
Detected by radio telescopes and using high-performance computers, the radiation from stars, galaxies, and other objects in space can be transformed into an astronomical image.
This processing is powered by the next-generation radio astronomy software package, AIPS++, community code currently under development by a consortium of observatories from around the world.
Through an Alliance partnership with the National Radio Astronomy Observatory, NCSA provides AIPS++ with support for the latest parallel platforms, allowing it to take full advantage of the grid.
archive.ncsa.uiuc.edu /Science/Radio   (179 words)

 Radio Astronomy Books
No serious amateur (and certainly no professional) radio astronomer should be without this technical introduction to all of the major aspects of radio astronomy.
This is an excellent book to introduce the beginner to the new astronomies which arose in the 20th century, including radio astronomy.
The helical antennas are great for beginning radio astronomers, and perhaps, most important is Kraus's presentation of an actual stripchart and how it is interpreted.
www.radiosky.com /booksra.html   (468 words)

 Department of Astronomy: UF Radio Observatory   (Site not responding. Last check: 2007-10-07)
This basic system can be easily adapted for making automatic observations of the solar low frequency radio emission and for the observation of continuum radio sources with the 640 dipoles large array.
Radio JOVE: Planetary Radio Astronomy for Schools from NASA
Radio JOVE: Space Science News Article (May 22, 2000)—"Jupiter is a powerful of radio bursts available on ham radio receivers.
www.astro.ufl.edu /radioobs.html   (694 words)

 Radio Astronomy Web Ring
All aspects of radio astronomy are explored including solar flare detection, Jupiter noise storm monitoring, meteor detection by radio, and more.
Radio astronomy techniques are developed to study the sun, the solar wind, and the ionosphere.
A 1420 MHz amateur radio telescope for studying the dynamics of neutral Hydrogen throughout the galaxy.
a.webring.com /hub?ring=radioastro   (667 words)

 radio-telescope for radio astronomy
The article was not particularly strong on the electronics (which we are) but reasonably comprehensive on basic radio astronomy for radio telescopes (which we are not).
At the threshold of VHF a low noise preamplifier is obligatory to establish as low a noise figure as is possible for a radio telescope to overcome the limitations of inherent receiver noise.
In this case we present our radio telescope antenna input after the balun to a 30 Mhz (nominal) two stage low pass filter.
my.integritynet.com.au /purdic/radio-telescope.htm   (4980 words)

 CFARO   (Site not responding. Last check: 2007-10-07)
Radio recieving equipment transform electromagnetic emissions from the cosmos into an electrical signal that can be charted or listened to.
Since I have always been facinated by the invisible world of the radio spectrum I decided that this would be an excellent opportunity to expand my intrest in radio astronomy.
The S bursts are represented by tall spikes and L bursts are represented by humps in the radio continuum.
pages.sssnet.com /starman444/astronomy/radio.html   (897 words)

 Encyclopedia article on Radio astronomy [EncycloZine]   (Site not responding. Last check: 2007-10-07)
The United States government has established an institution to conduct radio astronomy research, titled the National Radio Astronomy Observatory (commonly abbreviated as NRAO).
The History of the Nancay Radio Observatory (http://www.obs-nancay.fr/usn/a_histor.htm) - a history of French radio astronomy
The History of Radio Astronomy (http://web.haystack.mit.edu/education/radiohist.html) - Haystack Observatory, MIT
encyclozine.com /Radio_astronomy   (607 words)

 Radio Astronomy   (Site not responding. Last check: 2007-10-07)
Each mission involves an orbiting 8-10 meter radio telescope dedicated to astronomical radio interferometry experiments using baselines formed between the spacecraft and a number of ground radio telescopes.
Torun Radio Astronomy Observatory (TRAO) is an educational and research facility to study the Universe by means of radio waves.
The Radio Astronomy Group (RAG) of ETH in Zurich, Switzerland recorded solar radio spectrograms with an analog spectrometer called Daedalus(1974-1993) in the range of 100-1000 MHz.
www.astroweb.com.ar /astroweb/yp_radio.html   (3494 words)

 AllRefer.com - radio astronomy (Astronomy, General) - Encyclopedia
AllRefer.com - radio astronomy (Astronomy, General) - Encyclopedia
You are here : AllRefer.com > Reference > Encyclopedia > Astronomy, General > radio astronomy
radio astronomy, study of celestial bodies by means of the electromagnetic radio frequency waves they emit and absorb naturally.
reference.allrefer.com /encyclopedia/R/radioast.html   (138 words)

 Radio Astronomy and SETI - Big Ear Radio Observatory Home Page
The land on which the observatory was sitting (owned by the Ohio Wesleyan University, Delaware, Ohio) was sold by them in 1983 to land developers who later claimed their rights to develop the land.
This website is meant to serve as a memorial to that unique radio telescope, to its designer and builder (the late Dr. John D. Kraus) and the many persons involved with the telescope, and to the discoveries made with that instrument.
The Observatory was named after the Big Ear Radio Telescope (demolished in 1998) -- a Kraus-type radio telescope (named for Dr. John D. Kraus, the founder and director of the observatory, who was also the designer and builder of the telescope).
www.bigear.org   (680 words)

 Amazon.com: Books: An Introduction to Radio Astronomy   (Site not responding. Last check: 2007-10-07)
Radio astronomy uses unique observational techniques and offers the only way to investigate many phenomena in the Universe.
Presents both a clear introduction to radio telescopes and techniques, and a broad overview of the radio universe.
This book is a great Radio Astronomy text for the undergraduate major or the graduate level.
www.amazon.com /exec/obidos/tg/detail/-/052155604X?v=glance   (635 words)

 The University of Calgary Radio Astronomy Laboratory
Radio astronomy research at the University of Calgary involves the study of stellar, interstellar, and extragalactic radio emission.
Dominion Radio Astrophysical Observatory, located within a day's drive in the mountains of British Columbia.
A number of other Astronomy and Astrophysics people at the University of Calgary in are also involved in radio astronomy.
www.ras.ucalgary.ca   (217 words)

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