| 单词 |
penumbral waves |
| 释义 |
penumbral waves penumbral waves[pə′nəm·brəl ′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 |
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