捷克上空的红色精灵
2022年9月12日
Red Sprite Lightning over the Czech Republic
Image Credit & Copyright: Daniel Ščerba
Explanation: What are those red filaments in the sky? They are a rarely seen form of lightning confirmed only about 35 years ago: red sprites. Research has shown that following a powerful positive cloud-to-ground lightning strike, red sprites may start as 100-meter balls of ionized air that shoot down from about 80-km high at 10 percent the speed of light. They are quickly followed by a group of upward streaking ionized balls. The featured image was taken late last month from the Jeseniky Mountains in northern Moravia in the Czech Republic. The distance to the red sprites is about 200 kilometers. Red sprites take only a fraction of a second to occur and are best seen when powerful thunderstorms are visible from the side.
APOD in world languages: Arabic, Bulgarian, Catalan, Chinese (Beijing), Chinese (Taiwan), Croatian, Czech, Dutch, Farsi, French, French (Canada),
German, Hebrew, Indonesian, Japanese, Korean, Montenegrin, Polish, Russian, Serbian, Slovenian, Spanish, Taiwanese, Turkish, and Ukrainian
Tomorrow’s picture: sun snake
捷克上空的红色精灵
影像提供与版权: Daniel Ščerba
说明: 天空中这些泛红的丝状物是什么？它是一种罕见的、35年前才获得确认的、名为红色精灵的高空放电现象。经过研究证实，在强烈的正云对地闪电之后，偶而会诱发红色精灵；它刚形成时，是一团约在80公里高空、大小在100公尺左右的团状电离空气，然后以10之1的光速向下发伸展，紧接着出现成群向上发展的电离球。这幅主题影像，呈现一例在上个月摄于捷克．摩拉维亚区北部的Jeseniky山脉，远在200公里之外的一群红色 精灵。红色精灵发光的时间只有短短的几分之一秒，最佳的观测方式，是从侧边监看活跃的雷暴系统。
世界语言的APOD: 阿拉伯语，保加利亚语，加泰罗尼亚语，中文(北京)，中文(台湾)，克罗地亚语，捷克语，荷兰语，波斯语，法语，法语(加拿大)，
德语，希伯来语，印度尼西亚语，日语，韩语，黑山语，波兰语，俄语，塞尔维亚语，斯洛文尼亚语，西班牙语，台湾语，土耳其语，和乌克兰语
明日的图片: sun snake
