气候变化领域集成服务门户(CCPortal): Radio Interferometer Observations of an Energetic in-Cloud Pulse Reveal Large Currents Generated by Relativistic Discharges

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DOI	10.1029/2020JD032603
	Radio Interferometer Observations of an Energetic in-Cloud Pulse Reveal Large Currents Generated by Relativistic Discharges
	Tilles J.N.; Krehbiel P.R.; Stanley M.A.; Rison W.; Liu N.; Lyu F.; Cummer S.A.; Dwyer J.R.; Senay S.; Edens H.; Fan X.; Brown R.G.; Wilson J.
发表日期	2020
ISSN	2169897X
卷号	125 期号:20
英文摘要	The production mechanism for terrestrial gamma ray flashes (TGFs) is not entirely understood, and details of the corresponding lightning activity and thunderstorm charge structure have yet to be fully characterized. Here we examine sub-microsecond VHF (14–88 MHz) radio interferometer observations of a 247-kA peak-current EIP, or energetic in-cloud pulse, a reliable radio signature of a subset of TGFs. The EIP consisted of three high-amplitude sferic pulses lasting ≃60 μs in total, which peaked during the second (main) pulse. The EIP occurred during a normal-polarity intracloud lightning flash that was highly unusual, in that the initial upward negative leader was particularly fast propagating and discharged a highly concentrated region of upper-positive storm charge. The flash was initiated by a high-power (46 kW) narrow bipolar event (NBE), and the EIP occurred about 3 ms later after ≃3 km upward flash development. The EIP was preceded ≃200 μs by a fast 6 × 106 m/s upward negative breakdown and immediately preceded and accompanied by repeated sequences of fast (107–108 m/s) downward then upward streamer events each lasting 10 to 20 μs, which repeatedly discharged a large volume of positive charge. Although the repeated streamer sequences appeared to be a characteristic feature of the EIP and were presumably involved in initiating it, the EIP sferic evolved independently of VHF-producing activity, supporting the idea that the sferic was produced by relativistic discharge currents. Moreover, the relativistic currents during the main sferic pulse initiated a strong NBE-like event comparable in VHF power (115 kW) to the highest-power NBEs. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	broadband VHF interferometer; energetic in-cloud pulse (EIP); high peak current; narrow bipolar event (NBE); relativistic discharge; 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/185688
作者单位	Department of Physics and Space Science Center, University of New Hampshire, Durham, NH, United States; Langmuir Laboratory for Atmospheric Research, New Mexico Tech, Socorro, NM, United States; Electrical and Computer Engineering Department, Duke University, Durham, NH, United States; State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China; NASA Kennedy Space Center, Kennedy Space CenterFL, United States
推荐引用方式 GB/T 7714	Tilles J.N.,Krehbiel P.R.,Stanley M.A.,et al. Radio Interferometer Observations of an Energetic in-Cloud Pulse Reveal Large Currents Generated by Relativistic Discharges[J],2020,125(20).
APA	Tilles J.N..,Krehbiel P.R..,Stanley M.A..,Rison W..,Liu N..,...&Wilson J..(2020).Radio Interferometer Observations of an Energetic in-Cloud Pulse Reveal Large Currents Generated by Relativistic Discharges.Journal of Geophysical Research: Atmospheres,125(20).
MLA	Tilles J.N.,et al."Radio Interferometer Observations of an Energetic in-Cloud Pulse Reveal Large Currents Generated by Relativistic Discharges".Journal of Geophysical Research: Atmospheres 125.20(2020).