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  1. janskynoun

    A non-SI unit measuring electromagnetic flux density equal to 10 watts per square meter per hertz. The symbol for jansky is Jy.

    Etymology: Named after radio astronomer Karl Guthe Jansky.


  1. Jansky

    The flux unit or jansky is a non-SI unit of spectral flux density equivalent to 10−26 watts per square metre per hertz. The flux density or monochromatic flux, of a source is the integral of the spectral radiance, over the source solid angle: The unit is named after pioneering US radio astronomer Karl Guthe Jansky, and is defined as: The flux density in Jy can be converted to a magnitude basis, for suitable assumptions about the spectrum. For instance, converting an AB magnitude to a flux-density in microjanskys is straightforward: 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 reports results in Jy. For extended sources, the surface brightness is often described with units of Jy per solid angle; for example, Far Infra-Red maps from the IRAS satellite are in MJy/sr. While 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.

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  1. Chaldean Numerology

    The numerical value of Jansky in Chaldean Numerology is: 4

  2. Pythagorean Numerology

    The numerical value of Jansky in Pythagorean Numerology is: 8

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  1. Jansky

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    brought into agreement or cooperation on the side of a faction, party, or cause
    • A. blistering
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