Astronomy
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Jansky is the unit of radiation density, or flux, usually associated with ]]radio emission]]. It was named in honour of Karl Jansky, the first radio astronomer.

The Jansky or Jy has the units 10-26 Watts Metre-2 Hertz-1 or 10-26 W m-2 Hz-1

Radio sources of milliJanksy or mJy are routinely detected by modern radio telescopes.

Some common units are:

nJy = 10-9 Jy μJy = 10-6 Jy mJy = 10-3 Jy kJy = 103 Jy

References

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