| 单词 | corona |
| 释义 | corona 1 The outer part of the sun's atmosphere. Its two main components are the K-corona (or inner corona), with a temperature of about 2 × 106 K at a height of some 75 000 km, and the F-corona (or outer corona), which is considerably cooler and extends for several million kilometres into space. 2 A glowing region of the air surrounding a conductor when the potential gradient near it exceeds a critical value. It is caused by ionization of the air and may be accompanied by hissing sounds. Corona discharge (or point discharge ) occurs at sharp points where the surface charge density is high by the attraction, charging, and consequent repulsion of air molecules. |
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