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jansky, Jy
A unit of radiation received from outer space, used in radio astronomy.

It is equal to 10-26 watts per square meter per hertz, and is named for the U.S. radio engineer, Karl Jansky (1905-1950).

2. A unit used to indicate the strength of radio sources in astronomy.
3. A unit of work or energy in the International System of Units (SI) which is equal to the work done by a force of one newton (that force necessary to provide a mass of one kilogram with an acceleration of one meter per second per second).
This entry is located in the following unit: Measurements and Mathematics Terms (page 7)