| 单词 | plage region |
| 释义 | > as lemmasplage region 4. Astronomy. A region of the sun's chromosphere which is particularly bright in the emission spectra of calcium and hydrogen, usually associated with faculae (bright spots) in the photosphere and often with sunspots. Also plage region. ΘΚΠ the world > the universe > sun > solar activity > [noun] > mark on sun > sunspot > in corona sun dog1635 plage1949 1949 Astrophysical Jrnl. 110 244 Flares which became at least twice as bright as the surrounding plage. 1954 Astrophysical Jrnl. 119 564 There are many plages in which spots do not become visible; but we do not..have any observations of a spot without at least some trace of a bright, associated plage. 1970 Nature 18 Apr. 249/2 Several prominences and a plage region are clearly visible in Lyman α. 1997 D. V. Hoyt & K. H. Schatten Role of Sun in Climate Change iii. 48 Sunspots, aurorae, and geomagnetic disturbances vary in an 11-year cycle. So do many other solar features, including faculae and plages, which are bright regions seen in visible and monochromatic light, respectively. < as lemmas |
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