干旱区生态环境知识资源中心(Arid): Ground-Based Observations of Terrestrial Gamma Ray Flashes Associated with Downward-Directed Lightning Leaders

Arid

DOI	10.1051/epjconf/201919703002
	Ground-Based Observations of Terrestrial Gamma Ray Flashes Associated with Downward-Directed Lightning Leaders
	Abbasi, Rasha 1; Belz, John 1; Le Von, Ryan 1; Rodeheffer, Dan 2; Krehbiel, Paul 2; Remington, Jackson 1; Rison, William 2
通讯作者	Abbasi, Rasha
会议名称	International Workshop on Atmospheric Monitoring for High Energy Astroparticle Detectors (AtmoHEAD)
会议日期	SEP 24-26, 2018
会议地点	ITALY
英文摘要	Terrestrial gamma-ray flashes (TGFs) are bursts of gamma-rays initiated in the Earth's atmosphere. TGFs were serendipitously first observed over twenty years ago by the BATSE gamma ray satellite experiment. Since then, several satellite experiments have shown that TGFs are produced in the upward negative breakdown stage at the start of intracloud lightning discharges. In this proceeding, we present ground-based observation of TGFs produced by downward negative breakdown occurring at the beginning of negative cloud-to-ground flashes. The Terrestrial gamma-ray flashes discussed in this work were detected between 2014-2017 at ground level by the Telescope Array surface detector (TASD) together with Lightning Mapping Array (LMA) and the slow electric field antenna (SA). The TASD detector is a 700 km(2) ultra high energy cosmic ray detector in the southwestern desert of Utah. It is comprised of 507 (3 m(2)) plastic scintillator detectors on a 1.2 km square grid. The LMA detector, a three-dimensional total lightning location system, is comprised of nine stations located within and around the array. The slow electric field antenna records the electric field change in lightning discharges. The observed Gamma ray showers were detected in the first 1-2 ms of downward negative breakdown prior to cloud-to-ground lightning strikes. The shower sources were observed by the LMA detector at altitudes of a few kilometers above ground level. The detected energetic burst showers have a footprint on the ground typically similar to 3-5 km in diameter. The bursts comprise of several (2-5) individual pulses, each of which have a span of a few to tens of microseconds and an overall duration of several hundred microseconds. Using a forward-beamed cone of half-angle of 16 degrees, GEANT simulation studies indicate that the showers are consistent with gamma rays of 10(12) - 10(14) primary photons. We hypothesize that the observed terrestrial gamma-ray flashes are similar to those detected by satellites, but that the ground-based observations are closer to the source and therefore are able to observe weaker sources and report on the structure of the temporal distribution at the source. This result and future studies will enable us to better identify and constrain the mechanisms of downward TGF production.
来源出版物	ATMOSPHERIC MONITORING FOR HIGH ENERGY ASTROPARTICLE DETECTORS (ATMOHEAD) 2018
ISSN	2100-014X
出版年	2019
卷号	197
EISBN	*****************
出版者	E D P SCIENCES
类型	Proceedings Paper
语种	英语
国家	USA
开放获取类型	Green Published, gold
收录类别	CPCI-S
WOS记录号	WOS:000471295900017
WOS关键词	ARRAY
WOS类目	Astronomy & Astrophysics
WOS研究方向	Astronomy & Astrophysics
资源类型	会议论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/308281
作者单位	1.Univ Utah, Dept Phys, Salt Lake City, UT 84112 USA; 2.New Mexico Inst Min & Technol, Langmuir Lab Atmospher Res, Socorro, NM 87801 USA
推荐引用方式 GB/T 7714	Abbasi, Rasha,Belz, John,Le Von, Ryan,et al. Ground-Based Observations of Terrestrial Gamma Ray Flashes Associated with Downward-Directed Lightning Leaders[C]:E D P SCIENCES,2019.