英语词汇“spectroheliogram”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

　

单词	spectroheliogram
释义	spectroheliogram spec·tro·he·li·o·gram S0618400 (spĕk′trō-hē′lē-ə-grăm′)n. A photograph of the sun taken in a narrow wavelength band centered on a selected wavelength. spec•tro•he•li•o•graph (ˌspɛk troʊˈhi li əˌgræf, -ˌgrɑf) n. an apparatus for making a photograph of the sun (spectroheliogram) in a single spectral band. [1890–95] spec`tro•he`li•o•graph′ic, adj. spectroheliogram a photograph of the sun made using monochromatic light.See also: Photography spectroheliogram spectroheliogram (spek-troh-hee -lee-ŏ-gram) A photograph of the solar chromosphere taken in the monochromatic light of certain strong Fraunhofer lines – usually the hydrogen-alpha (Hα) line of neutral hydrogen at 656.3 nm or the K line of singly ionized calcium at 393.4 nm – using a spectroheliograph. When a photograph is taken using a telescope equipped with a suitable narrow-band interference filter, it is usually called a filtergram. By changing the wavelength slightly, different levels in the chromosphere can be photographed and information obtained on the vertical extent of any features present. spectroheliogram [¦spek·trō′hē·lē·ə‚gram] (astronomy) A photograph of the sun obtained by means of a spectroheliograph.
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更新时间：2024/12/31 21:53:12