“penumbral waves”的概念、定义、翻译、参考文献-科学参考

单词	penumbral waves
释义	penumbral waves [pǝ`nǝm·brǝl `wāvz] ^ASTRONOMY Waves that are often observed to propagate outward across the penumbrae of large sunspots when the penumbrae are viewed in the light of the Hα spectral line of hydrogen.
随便看	direct scattering theory direct screen halftone direct sequence system direct solar radiation direct stratification direct stroke direct sum direct support artillery direct symbol recognition direct tide direct variation direct viewfinder direct-view storage tube direct-vision nephoscope direct-vision prism direct-vision spectroscope direct voltage direct wave direct-wire circuit direct-writing galvanometer direct-writing recorder Dirichlet conditions Dirichlet drawer principle Dirichlet problem Dirichlet series

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