| 释义 |
极光jíguāng在高纬度地区,高空中大气稀薄的地方出现的一种光的现象。由太阳发出的高速带电粒子受地球磁场影响,进入两极附近,激发高空中的原子和分子而引起。通常是弧状、带状或幕状,微弱时白色,明亮时黄绿色,有时还有红、灰、紫、蓝等色。{aurora or polar lights; radiant emission from the rarefied upper atmosphere that occurs sporadically over places of high latitudes in the form of luminous arcs, bands, screens, or the like, turning white when waning and yellowish green when bright, looking red, grey, purple and blue occasionally, caused by the bombardment of the atmosphere with charged solar particles being guided along the earth's magnetic lines of force} |