| 单词 | reversing layer |
| 释义 | > as lemmasreversing layer reversing layer n. Astronomy now chiefly historical the lower region of the solar chromosphere, formerly regarded as a distinct layer where the dark Fraunhofer lines of the solar spectrum are produced, superimposed on the continuous spectrum of the underlying photosphere. ΘΚΠ the world > the universe > sun > [noun] > reversing layer reversing layer1873 1873 Leeds Mercury 23 Sept. 6/3 There were, in all probability, no compounds ordinarily present in the sun's reversing layer. 1936 S. Chandrasekhar in Monthly Notices Royal Astron. Soc. 96 22 An obvious effect of the formation of the Fraunhofer lines in the ‘reversing layer’ is to keep the photosphere warmer. 1989 R. M. Goody & Y. L. Yung Atmospheric Radiation (ed. 2) 482 After falling to 4200 K in the reversing layer, the temperature rises to 20–50,000 K in the transition region..between chromosphere and corona. 2000 D. H. DeVorkin Henry Norris Russell xiv. 213 The old idea of a discrete reversing layer had to be modified. < as lemmas |
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