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ÌâÄ¿£ºCharacteristics of negative lightning leaders to ground observed by TVLS
ÔÓÖ¾£ºJournal of Atmospheric and Solar-Terrestrial Physics
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DOI£º10.1016/j.jastp.2015.07.008
¾í£º136, Part A
Äê·Ý£º2015

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stone7058: ½ð±Ò+5, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸ 2016-10-11 07:49:21
lazy½õϪ: LS-EPI+1 2016-10-11 10:59:20
Characteristics of negative lightning leaders to ground observed by TVLS
×÷Õß:Qiu, S (Qiu, Shi)[ 1 ] ; Jiang, ZD (Jiang, Zhidong)[ 1 ] ; Shi, LH (Shi, Lihua)[ 1 ] ; Niu, ZC (Niu, Zhencong)[ 2 ] ; Zhang, P (Zhang, Peng)[ 3 ]
JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
¾í: 136  Ò³: 31-38  ×Ó¼­: A  ÌØ¿¯: SI
DOI: 10.1016/j.jastp.2015.07.008
³ö°æÄê: DEC 2015
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The Thunder and VHF lightning Locating System (termed TVLS) is established and utilized to observe leader behaviors of negative cloud to ground (CG) flashes. This system takes advantages of VHF broad-band interferometer and thunder imaging technique, which could provide the temporal and quasi-3D spatial evolution of lightning discharges. In conjunction with synchronized electric field changes (E-changes) and electric field derivatives (dE/dt) records, 10 leaders from two CG flashes are presented and analyzed. Based on the characteristic evolution of leader velocities, E-changes, dE/dt waveforms and VHF intervals, three stepped leaders, five dart leaders and two dart-stepped leaders are identified. The stepped leaders behave impulsive while approaching ground, with average speed (1.3 similar to 3.9) x 10(5) m/s. All normal dart leaders presented here exhibit irregular (or termed "chaotic" fluctuations in E-change and dE/dt waveforms, with the similar speeds ((1.0 similar to 2.9) x 10(7) m/s) and durations ((300 similar to 700) mu s) of the "chaotic" leaders observed by other investigators. The irregular fluctuations would be weak if the channels keep conductive until the leader enters the less conductive branches, coinciding with VHF radiations in time sequence. The dart-stepped leader could be divided into the dart stage and the stepped stage by a transition region, which usually lies around the branch junctions of previous active channel. The dart stage resembles the normal dart leader, and the stepped stage usually associates with regular pulse trains in E-change and dE/dt waveforms. (C) 2015 Elsevier Ltd. All rights reserved.
¹Ø¼ü´Ê
×÷Õ߹ؼü´Ê:Lightning leader; Dart-stepped; Chaotic; TVLS
KeyWords Plus:RETURN STROKES
×÷ÕßÐÅÏ¢
ͨѶ×÷ÕßµØÖ·: Qiu, S (ͨѶ×÷Õß)
ÏÔʾÔöÇ¿×éÖ¯ÐÅÏ¢µÄÃû³Æ        PLA Univ Sci & Technol, Natl Key Lab Electromagnet Environm Effects & Ele, Nanjing, Jiangsu, Peoples R China.
µØÖ·:
ÏÔʾÔöÇ¿×éÖ¯ÐÅÏ¢µÄÃû³Æ        [ 1 ] PLA Univ Sci & Technol, Natl Key Lab Electromagnet Environm Effects & Ele, Nanjing, Jiangsu, Peoples R China
              [ 2 ] Army Aviat Inst, Beijing, Peoples R China
ÏÔʾÔöÇ¿×éÖ¯ÐÅÏ¢µÄÃû³Æ        [ 3 ] PLA Univ Sci & Technol, Nanjing, Jiangsu, Peoples R China
µç×ÓÓʼþµØÖ·:zeustone@yeah.net; jzd19851102@163.com; shilih@tom.com; gamit@163.comt; radarpeng@126.com
»ù½ð×ÊÖúÖÂл
»ù½ð×ÊÖú»ú¹¹        ÊÚȨºÅ
National Natural Science Foundation of China        
61301063
²é¿´»ù½ð×ÊÖúÐÅÏ¢   
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PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
Àà±ð / ·ÖÀà
Ñо¿·½Ïò:Geochemistry & Geophysics; Meteorology & Atmospheric Sciences
Web of Science Àà±ð:Geochemistry & Geophysics; Meteorology & Atmospheric Sciences
ÎÄÏ×ÐÅÏ¢
ÎÄÏ×ÀàÐÍ:Article
ÓïÖÖ:English
Èë²ØºÅ: WOS:000366789900006
ISSN: 1364-6826
eISSN: 1879-1824
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Impact Factor (Ó°ÏìÒò×Ó): Journal Citation Reports®
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IDS ºÅ: CZ0JA
Web of Science ºËÐĺϼ¯ÖÐµÄ "ÒýÓõIJο¼ÎÄÏ×": 20
Web of Science ºËÐĺϼ¯ÖÐµÄ "±»ÒýƵ´Î": 0
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