| 释义 |
Van Allen|væn ˈælən|
Also (erron.) van Allen.
The name of James A. Van Allen (b. 1914), U.S. physicist, used attrib. to designate each of two regions reported by him in 1958, partly surrounding the earth at heights of several thousand kilometres and containing intense radiation and many high-energy charged particles trapped by the earth's magnetic field; also applied to similar regions around other planets.
1959Nature 8 Aug. 439 (heading) The upper boundary of the Van Allen radiation belts. 1965Wireless World Sept. 447/1 This [sensitivity to radiation damage] limits the application of junction detectors in reactor instrumentation and in the van Allen belts. 1971Nature 28 May 217/2 The circular polarization of about one per cent which is emitted by the planet Jupiter indicates the presence of a field of 0·4 gauss in its van Allen belts. 1974Times Lit. Suppl. 13 Sept. 968/2 It girds us Transparently like the Van Allen Belt, Simply like the tie-belt of a mac. 1983New Scientist 13 Jan. 93/2 They penetrated the Van Allen radiation belt (which is contained by the Earth's magnetic field) and loosened showers of electrons. |