| 释义 |
jansky, n. Astron.|ˈdʒænskɪ|
Also with capital initial.
[The name of Karl G. Jansky (1905–50), U.S. radio engineer.]
A unit of electromagnetic flux density used in radio astronomy, equal to 10-26 watts per square metre per hertz. Symbol Jy (see *J III.).
1966J. D. Kraus Radio Astron. iii. 66 The name jansky (abbreviated jan), after the pioneer radio astronomer Karl G. Jansky, has been proposed for this unit. 1975Internat. Astron. Union Information Bull. Jan. 7 Commission 40 resolved that the name ‘Jansky’, abbreviated ‘Jy’, be adopted as the unit of flux density in radio astronomy. 1979Sky & Telescope Feb. 134/2 As the star rose above the horizon, he found that it was emitting at 0.5 jansky. 1985Times 23 Jan. 16/6 A strong radio source would provide a signal of several hundred janskys. |