什么导致了"正面"闪电是少见的,更高的指控,比“负面”闪电,并且持续的时间更久吗?- 江南体育网页版- - - - -地球科学堆江南电子竞技平台栈交换 最近30从www.hoelymoley.com 2023 - 07 - 10 - t12:31:34z //www.hoelymoley.com/feeds/question/305 https://creativecommons.org/licenses/by-sa/4.0/rdf //www.hoelymoley.com/q/305 23 什么导致了"正面"闪电是少见的,更高的指控,比“负面”闪电,并且持续的时间更久吗? DrewP84 //www.hoelymoley.com/users/38 2014 - 04 - 17 - t22:33:55z 2015 - 03 - 02 - t01:07:57z < p >为什么"正面"闪电少见,更亮,更高的指控,比“负面”闪电,并且持续的时间更久吗?还有其他独特的特征正闪电,使它有别于更常见的负闪电吗?< / p > < p > < >强正闪电vs负闪电< /强> < / p > < ul > <李>罕见:1:10 - 1:20(平均)李< / > < >李主管:10:1(平均)< /李> < / ul > < p >(我想象,亮度和时间相关的费用)。< / p > //www.hoelymoley.com/questions/305/-/309 # 309 11 hichris123回答的原因"正面"闪电是少见的,更高的指控,比“负面”闪电,并且持续的时间更久吗? hichris123 //www.hoelymoley.com/users/20 2014 - 04 - 17 - t23:29:38z 2015 - 03 - 02 - t01:07:57z < p >正闪电确实是非常有趣的。< a href = " http://www.srh.noaa.gov/jetstream/lightning/positive.htm " rel = " noreferrer " >根据国家气象局< / >,它有一个更高的安培数和电压的原因是由于由于空气的量,它必须通过到达地面。否则,它永远不会到达地面。< / p > < blockquote > < p >,因为它源自上层的风暴,<强>的空气量必须通过燃烧达到地面通常更大。因此,其电场通常远比消极罢工。< / >强闪光持续时间较长,和峰值和潜在的可以十倍大于消极罢工;高达300000安培,十亿伏!

This would also account for the brightness of positive lightning and the extended duration, as a higher amperage & voltage strike would appear brighter and take longer to dissipate.

This page talks about why positive lightning occurs. It says:

"Positive lightning" is a simple process of completing an electrical circuit from the cloud to the ground and back to the cloud. As negative lightning strikes the ground, the ground becomes negatively charged over a wide area. As the storm moves over this area and past it, the H+ in the upper reaches of the cloud feels this potential difference from the ground and sends out a positive streamer which, for all intents, looks like normal negative lightning. The ground sends up a negative streamer and once these two join, electrons from the ground flow upwards to the H+ in the top of the cloud. The ground then becomes neutral once again. The ground will hold the negative charge of dozens of negative strikes, building up a huge potential, before positive lightning will occur. This is why positive lightning is so powerful.

enter image description here

Positive lightning is probably so rare because it takes so many negative strikes in order for enough energy to build up to cause a positive lightening strike.

There are quite a few interesting facts about positive lightning:

Some interesting properties of positive lightning:

  • Positive lightning can be the dominate type of cloud-to-ground during the winter months and in the dissipating stage of a thunderstorm.

  • Positive lightning has been identified as a major source for the recently discovered sprites and elves. Sprites and elves are most likely lightning discharges but occur from 18-60 miles (30-95 km) in altitude, well above the parent thunderstorm.

  • Positive lightning is usually composed of one stroke (negative lightning typically consists of two or more strokes)

Another NOAA site says that positive lightning can strike "near the edge of a cloud", or even 10 miles away from the cloud! This means that a positive lighting strike could occur somewhere where the sky is blue, and it's not raining.

In addition, there is also a type of lightning called "bipolar" lightning, which changes its polarity.
Baidu
map