visible corona test 可见电晕试验
Testing and research on visible corona characteristics for high elevation DC equipment.
高海拔直流设备可见电晕特性的试验研究。
During Sunday's total solar eclipse, the moon covered the sun over Easter Island, so that only the faint, white ring of the sun's upper atmosphere, or corona, was visible.
周日发生在复活节岛上的日全食，月亮将太阳覆盖了起来，只有太阳上层大气所形成的一圈微弱的白色圆环或称日冕处于可见状态。
All that's visible during totality is the sun's relatively faint upper atmosphere, called the corona.
日全食期间能看见的只有太阳上部相对模糊的大气，被称为日冕。
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