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janskys
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After the first month, TV company's units in flux |
Last Seen in these Crosswords & Puzzles |
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Mar 1 2011 The Times - Cryptic |
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Plural form of jansky. |
Janskys might refer to |
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The Jansky (symbol Jy) is a non-SI unit of spectral flux density, or spectral irradiance, used especially in radio astronomy. It is equivalent to 10−26 watts per square metre per hertz. * The flux density or monochromatic flux, * * * * S * * * {\displaystyle S} * , of a source is the integral of the spectral radiance, * * * * B * * * {\displaystyle B} * , over the source solid angle:* * * * S * = * * ∬ * * source * * * B * ( * θ * , * ϕ * ) * * * d * * Ω * . * * * {\displaystyle S=\iint \limits _{\text{source}}B(\theta ,\phi )\,\mathrm {d} \Omega .} * The unit is named after pioneering US radio astronomer Karl Guthe Jansky and is defined as * * * * * 1 * * * Jy * * = * * 10 * * − * 26 * * * * * W * * * * m * * * 2 * * * * ⋅ * * * Hz * * * * * * * {\displaystyle 1~{\text{Jy}}=10^{-26}{\frac {\text{W}}{{\text{m}}^{2}{\cdot }{\text{Hz}}}}} * (SI) * * * * = * * 10 * * − * 23 * * * * * erg * * * s * * * ⋅ * * * * cm * * * 2 * * * * ⋅ * * * Hz * * * * * * * {\displaystyle =10^{-23}{\frac {\text{erg}}{{\text{s}}{\cdot }{\text{cm}}^{2}{\cdot }{\text{Hz}}}}} * (cgs).Since the jansky is obtained by integrating over the whole source solid angle, it is most simply used to describe point sources; for example, the Third Cambridge Catalogue of Radio Sources (3C) reports results in Jy. * * For extended sources, the surface brightness is often described with units of Jy per solid angle; for example, far-infrared (FIR) maps from the IRAS satellite are in MJy/sr. * Although extended sources at all wavelengths can be reported with these units, for radio-frequency maps, extended sources have traditionally been described in terms of a brightness temperature; for example the Haslam et al. 408 MHz all-sky continuum survey is reported in terms of a brightness temperature in K. |