| 单词 | meteor trail |
| 释义 | > as lemmasmeteor trail meteor trail n. Astronomy a bright streak of ionized gas formed by a meteor passing through the upper atmosphere, which can provide a reflector for radio communication. ΘΚΠ the world > the universe > constellation > comet or meteor > meteor > [noun] > trail train1559 fire flag1798 meteor streak1869 meteor trail1895 1895 Science 16 Aug. 185/2 Only two meteor trails were found on the plates. 1926 Sci. Monthly May 412/1 When a meteor trail is photographed, much more information can be obtained, owing to the fact that the photograph is a permanent record. 1958 Jrnl. Atmospheric & Terrestrial Physics 12 329 At an early stage it became apparent that reflections from meteor trails play an important part in v.h.f. ionospheric forward scattering. 1968 Radio Communication Handbk. (ed. 4) xii. 17/2 There are times when the more orthodox modes of propagation fail to provide a satisfactory means of communication and one or other of the various forms of propagation by scatter may then offer a useful alternative: these include tropospheric scatter, ionospheric scatter..and meteor-trail scatter. 1992 Astron. Now July 5/2 The idea is to record VHF radio meteor trail signals and compare them with the electrometer record. < as lemmas |
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