气候变化领域集成服务门户(CCPortal): Special Classes of Terrestrial Gamma Ray Flashes From RHESSI

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DOI	10.1029/2020JD033043
	Special Classes of Terrestrial Gamma Ray Flashes From RHESSI
	Smith D.M.; Kelley N.A.; Buzbee P.; Infanger A.; Splitt M.; Holzworth R.H.; Dwyer J.R.
发表日期	2020
ISSN	2169897X
卷号	125 期号:20
英文摘要	We report on three classes of terrestrial gamma ray flashes (TGFs) from the (RHESSI) satellite. The first class drives the detectors into paralysis, being observed usually through a few counts on the rising edge and the later tail of Comptonized photons. These events—and any bright TGF—reveal their true luminosity more clearly via their Compton tail than via the main peak, since the former is unaffected by the unknown beaming pattern of the unscattered radiation, and Comptonization mostly isotropizes the flux. This technique could be applied to TGFs from any mission. The second class is more than usually bright and long in duration. When the magnetic field at the conjugate point is stronger than at the nearby footpoint, we find that 4 out of 11 such events show a significant signal at the time expected for a relativistic electron beam to make a round trip to the opposite footpoint and back. We conclude that a large fraction of TGFs lasting more than a few hundred microseconds may include counts due to the upward moving secondary particle beam ejected from the atmosphere. Finally, using a new search algorithm to find short TGFs in RHESSI, we see that these tend to occur more often over the oceans than land, relative to longer-duration events. In the feedback model of TGF production, this suggests a higher thunderstorm potential, since more feedback per avalanche implies fewer “generations” of avalanches needed to complete the TGF discharge. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	atmospheric electricity; lightning; terrestrial gamma ray flash; TGF
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185693
作者单位	Santa Cruz Institute for Particle Physics and Physics Department, University of California, Santa Cruz, CA, United States; Cruise Automation, San Francisco, CA, United States; Google, LLC, Mountain View, CA, United States; Institute for Computational and Mathematical Engineering, Stanford University, Palo Alto, CA, United States; College of Aeronautics, Florida Institute of Technology, Melbourne, FL, United States; Department of Earth and Space Sciences, University of Washington, Seattle, WA, United States; Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, Durham, NH, United States
推荐引用方式 GB/T 7714	Smith D.M.,Kelley N.A.,Buzbee P.,et al. Special Classes of Terrestrial Gamma Ray Flashes From RHESSI[J],2020,125(20).
APA	Smith D.M..,Kelley N.A..,Buzbee P..,Infanger A..,Splitt M..,...&Dwyer J.R..(2020).Special Classes of Terrestrial Gamma Ray Flashes From RHESSI.Journal of Geophysical Research: Atmospheres,125(20).
MLA	Smith D.M.,et al."Special Classes of Terrestrial Gamma Ray Flashes From RHESSI".Journal of Geophysical Research: Atmospheres 125.20(2020).