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疾风骤雨,电闪雷鸣!石家庄迎较强雷雨天气!有人拍到了紫色闪电?专家:其实是白的

  • 2026-07-21 09:32:47
疾风骤雨,电闪雷鸣!石家庄迎较强雷雨天气!有人拍到了紫色闪电?专家:其实是白的

刚刚,石家庄大雨倾盆。不少网友在网上分享拍到的“雷霆场景”,尤其是“紫色闪电”讨论度颇高。配文更是五花八门:有人诙谐地说,“神仙打架”“有人在‘渡劫’’”;有人解读“这是在进行空气净化”。

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针对网络热议的问题,中国科学院大气物理研究所副研究员袁善锋给出答案。

“紫色闪电”是白色的

大家最近在夜空拍到的紫色闪电,本质上就是普通的闪电——空气被强电流击穿后形成的高温等离子体通道,通道中的氮气、氧气等气体分子和原子被激发或电离,随后释放出不同波长的光。这些光谱成分叠加在一起,再加上闪电通道亮度极高,人眼通常会感受到刺眼的白色或偏蓝白色。

之所以看到偏紫的色彩,主要原因是:

  • 短波长的蓝紫光是“显眼包”,更容易被散射和凸显,云层和天空背景可能被“染”成紫色或蓝紫色。也就是说,照片里“整片天空都紫了”,并不等于闪电本身就是紫色。它更像是普通闪电的强白光照亮云层后,经过大气传播和云层散射形成的颜色效果。

  • 不同时段的大气湿度、尘埃含量、云层厚度和云底高度,也会影响人们看到的颜色。傍晚、深夜、雨前和雨后的大气条件不同,同样一次雷暴过程,闪电在视觉上可能呈现出白色、蓝白色、紫色、粉紫色等不同效果。

  • 夜间拍摄强闪电时,设备往往会自动提高曝光、调整白平衡、开启HDR或多帧合成,并增强画面饱和度。这样一来,原本只是略偏蓝紫的云层背景,在照片中可能变得更鲜艳、更“紫”。

“只闪不响”的闪电也有声

只要闪电发生在低空对流层中,本质上都会产生雷声。放电通道会把周围空气急剧加热到极高温度,使空气迅速膨胀并产生剧烈震荡。这种震荡向外传播,就形成了冲击波,也就是我们听到的雷声。

我们听不到雷声,大多是因为:

雷声在传播到地面的过程中变弱了、偏折了,或者被挡住了。

可以把雷声想象成一圈圈向外扩散的声波。光传播得非常快,所以远处云里的闪电一亮,我们几乎马上就能看到;但声音传播得慢得多,而且在空气中会不断衰减。如果闪电发生得比较远,雷声走到我们这里时,可能已经弱到听不清了。

此外,城市中的高楼、地形起伏、背景噪声,也会进一步削弱人们对雷声的感知。

闪电不能净化空气

雷雨过后,很多人会觉得空气变清新,于是有人把这种感觉归因于“闪电净化空气”。这种说法并不准确。

雨后空气变清新,主要是因为降雨把空气中的尘埃、花粉和部分污染物冲刷掉了,同时风雨过程也改变了近地面空气状态。真正起到明显“清洗”作用的,主要是降雨和大气扩散,而不是闪电本身。

闪电发生时,强放电会促使空气中的氮气和氧气发生一系列化学反应,生成氮氧化物。在近地面环境中,氮氧化物属于大气污染相关成分,并不能简单理解为“净化物质”。在某些情况下,雷暴还可能与花粉颗粒破碎、过敏原扩散等问题有关,增加敏感人群呼吸道不适风险。

因此,更准确的说法是:闪电会触发大气化学反应,其中既有生态意义,也可能带来近地面污染风险;但不能把闪电简单理解成“空气净化器”。

来源:中国科学院大气物理研究所、河北交通广播

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  1. CONNECT:[ UseTime:0.001625s ] mysql:host=127.0.0.1;port=3306;dbname=nowww460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001121s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000567s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001104s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001133s ]
  6. SELECT * FROM `set` [ RunTime:0.023960s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.003463s ]
  8. SELECT * FROM `article` WHERE `id` = 533545 LIMIT 1 [ RunTime:0.000674s ]
  9. UPDATE `article` SET `lasttime` = 1784616749 WHERE `id` = 533545 [ RunTime:0.038890s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.009188s ]
  11. SELECT * FROM `article` WHERE `id` < 533545 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001386s ]
  12. SELECT * FROM `article` WHERE `id` > 533545 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.008883s ]
  13. SELECT * FROM `article` WHERE `id` < 533545 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005161s ]
  14. SELECT * FROM `article` WHERE `id` < 533545 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.020513s ]
  15. SELECT * FROM `article` WHERE `id` < 533545 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.058504s ]
0.295417s