The lightning-TGF relationship on microsecond timescales

被引：92
作者：
Cummer, Steven A. [1 ]
Lu, Gaopeng [1 ]
Briggs, Michael S. [2 ]
Connaughton, Valerie [2 ]
Xiong, Shaolin [2 ]
Fishman, Gerald J. [4 ]
Dwyer, Joseph R. [3 ]
机构：
[1] Duke Univ, Dept Elect & Comp Engn, Durham, NC 27708 USA
[2] Univ Alabama, CSPAR, Huntsville, AL 35805 USA
[3] Florida Inst Technol, Melbourne, FL 32901 USA
[4] NASA, Space Sci Off, Marshall Space Flight Ctr, Huntsville, AL 35812 USA
来源：
GEOPHYSICAL RESEARCH LETTERS | 2011年 / 38卷
关键词：
GAMMA-RAY FLASHES; AIR BREAKDOWN; DISCHARGES;
D O I：
10.1029/2011GL048099
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
We analyze the count rates of two terrestrial gamma-ray flashes (TGFs) detected by the Fermi Gamma-ray Burst Monitor (GBM) with the broadband magnetic fields (1 to 300 kHz) produced by the simultaneous lightning processes. The microsecond-scale absolute time accuracy for these data, combined with independent geolocations of the source lightning, enable this analysis with higher accuracy than previously possible. In both events, fast discharge-like processes occur within several tens of microseconds of the gamma-ray generation, although not with a consistent relationship. The magnetic field data also show a slower signal component produced by a source current that in both events mirrors the gamma-ray count rate closely in shape and time. This indicates electromagnetic radiation directly associated with the gamma-ray generation process and thus provides a new means for probing the internal physics of this enigmatic phenomenon. Citation: Cummer, S. A., G. Lu, M. S. Briggs, V. Connaughton, S. Xiong, G. J. Fishman, and J. R. Dwyer (2011), The lightning-TGF relationship on microsecond timescales, Geophys. Res. Lett., 38, L14810, doi: 10.1029/2011GL048099.
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页数：6
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