Luminosity progression in dart-stepped leader step formation

被引：19

作者：

Wang, D. ^{[1
]}

Takagi, N. ^{[1
]}

Uman, M. A. ^{[2
]}

Jordan, D. M. ^{[2
]}

机构：

[1] Gifu Univ, Dept Elect Elect & Comp Engn, Gifu, Japan

[2] Univ Florida, Dept Elect & Comp Engn, Gainesville, FL USA

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES | 2016年 / 121卷 / 24期

基金：

美国国家科学基金会;

关键词：

NEGATIVE LEADER; DISCHARGE; MECHANISM;

D O I：

10.1002/2016JD025813

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

Using a high-speed optical imaging system, we have observed the step formation bright pulse discharges occurring at the tip of dart-stepped leaders of rocket triggered lightning with a time resolution of 0.1 mu s and a spatial resolution of about 1.4 m. Each of the step formation pulse discharges appeared to initiate at a location immediately below the bottom of its previous pulse discharge and to propagate in bidirectional (upward and downward) waves with a speed on the order of 10(7) m/s. The downward waves of the pulse discharges tended to slow down significantly after they propagated a distance of about 2 m. Based on the results observed in this study and those published in literatures, we propose a conceptual view of leader step formation.

引用

页码：14612 / 14620

页数：9

共 17 条

[1] NOVEL OBSERVATIONS ON LIGHTNING DISCHARGES - RESULTS OF RESEARCH ON MOUNT SAN SALVATORE [J].