| 单词 | ion tail |
| 释义 | > as lemmasion tail ion tail n. Astronomy a cometary tail composed of ionized gases, typically forming a straight bluish tail pointing directly away from the sun; (more generally) a narrow stream of ions following the orbital trajectory of a planet or other body.Also called gas tail, plasma tail, type I tail; cf. dust tail n. at dust n.1 Additions.Ion tails only occur within a certain radius from the sun (c.300 million km); beyond this, the ionizing effects of solar radiation are too weak. ΚΠ 1957 L. Biermann in Observatory 77 109 The acceleration of the ion tails of comets (type I of Bredichin) has been recognized as being due to the interaction between the corpuscular radiation of the Sun and the tail plasma. 1984 Sci. News 8 Dec. 362/2 In addition, however, there is the much subtler ‘ion tail’ (sometimes completely invisible to the naked eye). 2007 B. W. Jones Discovering Solar Syst. (ed. 2) iii. 102 All the ions that have been identified in the ion tail could have been produced by the ionisation of atoms and molecular fragments in the coma. 2010 Amer. Geophysical Union Fall Meeting No. P53A 1508 Mercury's ion tail is composed of ions including sodium, potassium, and calcium. < as lemmas |
| 随便看 |
英语词典包含1132095条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。