Long recovery VLF perturbations associated with lightning discharges
Long recovery VLF perturbations associated with lightning discharges
复制标题
与闪电放电相关的长恢复甚低频扰动
DOI：
10.1029/2012ja017567
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发表时间：
2012
影响因子：
--
通讯作者：
Sushi I Kumar
中科院分区：
文献类型：
--
作者：
M. M. Salut;M. Abdullah;K. Graf;M. Cohen;B. Cotts;Sushi I Kumar
[1]D区电离层长恢复扰动是最近发现的早期甚低频事件的一个子类别，但人们对其了解甚少，其特点是电离层恢复时间特别长，最长可达20分钟（而更典型的恢复时间为20分钟）。本文介绍了马来西亚国家气象中心发射机记录的长时间电离层恢复事件的特征和发生率。观察到48起长时间恢复事件。根据GLD360和WWLLN数据确定每个事件的闪电放电位置，并将每个放电归类为陆地或海洋。结果提供了强有力的证据表明，长期恢复事件主要是由于发生在海上的闪电放电，尽管该地区的闪电活动是更普遍的土地。在48次长时间恢复事件中，42次归因于水上闪电活动。与所有早期甚低频事件相比，对长恢复事件的成因闪电的分析表明，这些长恢复事件在距离信号路径较远的地方可检测到闪电放电，这表明长恢复事件的散射模式不同。
[1] Long D-region ionospheric recovery perturbations are a recently discovered and poorly understood subcategory of early VLF events, distinguished by exceptionally long ionospheric recovery times of up to 20 min (compared to more typical ∼1 min recovery times). Characteristics and occurrence rates of long ionospheric recovery events on the NWC transmitter signal recorded at Malaysia are presented. 48 long recovery events were observed. The location of the causative lightning discharge for each event is determined from GLD360 and WWLLN data, and each discharge is categorized as being over land or sea. Results provide strong evidence that long recovery events are attributed predominately to lightning discharges occurring over the sea, despite the fact that lightning activity in the region is more prevalent over land. Of the 48 long recovery events, 42 were attributed to lightning activity over water. Analysis of the causative lightning of long recovery events in comparison to all early VLF events reveals that these long recovery events are detectable for lighting discharges at larger distances from the signal path, indicating a different scattering pattern for long recovery events.
影响因子：
4.4
作者：
van der Velde, Oscar A.;Bor, Jozsef;Farges, Thomas
通讯作者：
Farges, Thomas