| 释义 |
coronagraph Astron.|kɒˈrəʊnəgrɑːf, -æ-|
orig. corono-.
[f. corono-, combining form of corona, but modified to corona- under its influence + -graph, Gr. -γραϕος writing, writer.]
An instrument for photographing the sun's corona in full sunlight; also, a telescope for observing the sun's corona.
The photographic instrument is a combined form of Newtonian telescope and photographic camera, suggested by Dr. W. Huggins in a paper read before the Royal Society in 1882.
1885Sir H. Grubb Catal. Philos. Instr., Dr. Huggins' Coronograph for photographing Corona. 1890Capt. Darwin in Phil. Trans. 306 The Coronagraph was designed as the instrument which would give the best chance of rendering it possible to obtain photographs of the corona in sunlight. 1927Popular Astronomy XXXV. 267 The accurate adjustment of stationary coronagraphs with despatch. 1956H. S. Jones in A. Pryce-Jones New Outl. Mod. Knowl. 122 A special instrument called a coronagraph is used in which the direct light of the Sun is obscured by a disk, an artificial eclipse thereby being produced. 1970Nature 20 June 1139/2 The line intensity has to be observed to much larger distances than can be reached with coronagraphs.
Hence coˌronaˈgraphic a.; also coˈronogram, a photograph of the corona so obtained.
1890Tablet 25 Jan. 128 The special new coronagraphic instrument prepared for the occasion. 1955Sci. Amer. Feb. 24/3, I..went hard to work on the coronagraphic project. 1970Nature 20 June 1139/2 The coronagraphic method is restricted to the relatively bright innermost corona. |