“Fraunhofer lines”的概念、定义、翻译、参考文献-科学参考

Fraunhofer lines

Physics

Dark lines in the solar spectrum that result from the absorption by elements in the solar chromosphere of some of the wavelengths of the visible radiation emitted by the hot interior of the sun.

Astronomy

Absorption lines and bands in the spectrum of the Sun that were first labelled by J. von Fraunhofer in 1814. In decreasing wavelength from the red, they include A (759 nm), B (687 nm), C (656 nm), D (589 nm), E (527 nm), F (486 nm), G (431 nm), H (397 nm), and K (393 nm); Fraunhofer observed many other lines, labelling several weaker features a, b, etc. The A and B bands are due to absorption by oxygen molecules in the Earth’s atmosphere, and the a band is due to absorption by terrestrial water vapour, but the remainder result from absorption in the Sun’s photosphere. Most prominent are the D lines of sodium, the H and K lines of calcium, and the G band caused by neutral iron and the CH molecule, all of which are features of stars of spectral types F, G, and K.

Chemistry

Dark lines in the solar spectrum, discovered by Josef von Fraunhofer, that result from the absorption by elements in the solar chromosphere of some of the wavelengths of the visible radiation emitted by the hot interior of the sun.

单词	Fraunhofer lines
释义	Fraunhofer lines Physics Dark lines in the solar spectrum that result from the absorption by elements in the solar chromosphere of some of the wavelengths of the visible radiation emitted by the hot interior of the sun. Astronomy Absorption lines and bands in the spectrum of the Sun that were first labelled by J. von Fraunhofer in 1814. In decreasing wavelength from the red, they include A (759 nm), B (687 nm), C (656 nm), D (589 nm), E (527 nm), F (486 nm), G (431 nm), H (397 nm), and K (393 nm); Fraunhofer observed many other lines, labelling several weaker features a, b, etc. The A and B bands are due to absorption by oxygen molecules in the Earth’s atmosphere, and the a band is due to absorption by terrestrial water vapour, but the remainder result from absorption in the Sun’s photosphere. Most prominent are the D lines of sodium, the H and K lines of calcium, and the G band caused by neutral iron and the CH molecule, all of which are features of stars of spectral types F, G, and K. Chemistry Dark lines in the solar spectrum, discovered by Josef von Fraunhofer, that result from the absorption by elements in the solar chromosphere of some of the wavelengths of the visible radiation emitted by the hot interior of the sun.
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