jansky


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
Janskyclick for a larger image
Jansky

jansky

(jan -skee) Symbol: Jy. The unit of flux density adopted by the IAU in 1973 and used throughout the spectral range, especially for radio and far-infrared measurements; it is named after Karl Jansky, who discovered radio emission from the Milky Way in 1932. One jansky is equal to 10–26 watts per square meter per hertz. It is possible to calculate the equivalent flux density, S ν, in janskys from a value of magnitude at the effective wavelength, λeff, appropriate to a particular optical or infrared filter (see table). For example, an R magnitude of 3.2 corresponds to a flux density at 0.7 μm of
2770 × 10–0.4 × 3.2 Jy
i.e. 145 Jy. (The table gives the flux level for 0.0 magnitude.)

Jansky

 

a subsidiary unit of the spectral density of radiant flux. Used in radio astronomy, it is named in honor of K. Jansky (1905–50), an American scientist who discovered cosmic radio emission in 1932. Its abbreviation is Jy; 1 Jy = 10–26 watt per square meter per hertz.

jansky

[′jans·kē]
(astrophysics)
A unit of measurement of flux density, in units of watt · meter-2· hertz-1; 1 jansky is 10-26W · m-2· Hz-1. Abbreviated Jy.
References in periodicals archive ?
Once you know how to use it, it's a lot more convenient," added Jansky.
When there was a seasonal flu vaccine shortage a couple of years ago, Rivier didn't get any, but Southern New Hampshire Medical Center gave some doses for critical students," said Rivier's Jansky.
Halterman and Jansky are also looking for resistance to Verticillium wilt, another fungal disease that can remain in the soil for up to 10 years.
Jansky might have received the bills had they been followed up with a demand, a warrant to the deputy tax collector and a service warrant that would have been delivered to them at their home or workplace in accordance with a state law that she looked up.
Jansky Very Large Array (VLA) and a visible-light image of the same object from the Hubble Space Telescope.
Now, observations made by a team of researchers using the Jansky Very Large Array (VLA), a radio astronomy observatory in New Mexico, have confirmed predications that as the gas cloud collapses, it forms dense filamentary structures that absorb the star's ultraviolet radiation when it passes through them.
The book also includes a chapter on the historical development of radio astronomy, from the early contributions of Jansky and Reber, through the technology impetus created by the Second World War, to the rush to apply the new techniques (and the abundant hardware
Geneticist Shelley Jansky, as detailed in a story beginning on page 4 of this issue, is conducting sensory studies to see how consumers respond to baked potatoes that differ in variety and in how and where they were grown.
In short, I have seen the future and its name is Jansky Noise.
Jansky Very Large Array (VLA) of telescopes in the USA indicated that radio waves coming from the nova were probably the result of subatomic particles moving at nearly the speed of light interacting with magnetic fields.
Jansky Very Large Array (VLA), have discovered previously-unseen binary companions to a pair of very young protostars, which has now provided strong support for one of the competing explanations for how double-star systems form.