Terrestrial gamma ray flash production by lightning current pulses

被引：50

作者：

Carlson, B. E. ^{[1
]}

Lehtinen, N. G. ^{[1
]}

Inan, U. S. ^{[1
,2
]}

机构：

[1] Stanford Univ, Dept Elect Engn, Space Telecommun & Radiosci Lab, Stanford, CA 94305 USA

[2] Koc Univ, Dept Elect & Elect Engn, Istanbul, Turkey

来源：

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS | 2009年 / 114卷

基金：

美国国家科学基金会;

关键词：

RUNAWAY BREAKDOWN; AIR; THUNDERSTORMS; DISCHARGES; SIMULATION; BURSTS; FIELDS;

D O I：

10.1029/2009JA014531

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Terrestrial gamma ray flashes (TGFs) are brief bursts of gamma rays observed by satellites, typically in coincidence with detectable lightning. We incorporate TGF observations and the key physics behind current TGF production theories with lightning physics to produce constraints on TGF production mechanisms. The combined constraints naturally suggest a mechanism for TGF production by current pulses in lightning leader channels. The mechanism involves local field enhancements due to charge redistribution in current pulses and draws seed energetic particles from cold runaway in breakdown processes. The mechanism can reproduce the observed TGF time scale including multipulse TGFs, is in agreement with existing production altitude estimates, and may help explain TGF spectra by naturally producing unbeamed emissions.

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