Sprite possibly produced by two distinct positive cloud-to-ground lightning flashes

Sprite possibly produced by two distinct positive cloud-to-ground lightning flashes
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精灵可能是由两次不同的正云对地闪电产生的

DOI:
10.3319/tao.2016.07.22.01
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发表时间:
2017
期刊:
Terr. Atmos. Ocean. Sci.
影响因子:
--
通讯作者:
Jung-Kuang Chou
Jung-Kuang Chou
中科院分区:
其他
文献类型:
--
作者:
Jing Yang;Gaopeng Lu;Ningyu Liu;Mitsuteru Sato;Guili Feng;Yu Wang;Jung-Kuang Chou

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自2007年以来,中国大陆进行了瞬态发光事件(TLEs)观测,并记录了一些TLEs。这项研究分析了一个非常不寻常的和独特的正雪碧事件,这可能是由两个不同的正云对地闪电(+CG)发生在一个很短的时间差,但不同的位置分开约27公里联合产生。这一观察结果与以前的研究报告不同,以前的研究报告说,大多数精灵都是由一个单一的+CG闪光触发的,而且可能是在连续电流之后。对极低频(ELF)磁场的详细分析表明,这两个+CG产生的组合电荷矩变化(CMC)(~1478 C km)小于同一雷暴上记录的另外两个子暴的母CG(分别为1582和2134 C km)。子画面的垂直延伸和亮度与它们的父CG的CMC很好地对应,即CMC值越大,子画面越亮,CMC值越大,垂直延伸越大。在雷暴的生命周期中,负闪电占主导地位。这三个精灵发生在一个时间窗口,其中负和正闪光都活跃。这三个小精灵都发生在雷暴层状区上空。文章历史:接收于2016年2月13日修订于2016年7月14日接受于2016年7月22日
Transient luminous event (TLEs) observations have been conducted in mainland China since 2007, with a number of TLEs documented. This study analyzed a very unusual and unique positive sprite event, that may be produced jointly by two distinct positive cloud-to-ground lightning flashes (+CGs) occurring within a short time difference but with different locations separated by about 27 km. This observation is different from previous studies reporting that most of the sprites were triggered by a single +CG flash and its possible following continuous current. Detailed analysis on extremely low frequency (ELF) magnetic field shows that combined charge moment change (CMC) due to the two +CGs is smaller (~1478 C km) than those of the parent CGs for the other two sprites (1582 and 2134 C km, respectively) recorded over the same thunderstorm. The vertical extension and brightness of the sprites correspond well with the CMC of their parent CGs, namely, the larger the CMC value the brighter the sprite, and the larger the CMC value the larger the vertical extension. Negative lightning flashes dominated during the thunderstorm life cycle. The three sprites occurred during a time window in which both negative and positive flashes were active. The three sprites occurred over the thunderstorm stratiform region. Article history: Received 13 February 2016 Revised 14 July 2016 Accepted 22 July 2016
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