晚霞；余晖日落后，天空中的大气所发散出的短暂光辉 The atmospheric glow that remains for a short time after sunset.
电晕在电晕放电中在高压电极出现的一种微弱光辉，常伴随有朝向低压电极的电流 A faint glow enveloping the high-field electrode in a corona discharge, often accompanied by streamers directed toward the low-field electrode.