Detection of in-cloud lightning with VLF/LF and VHF networks for studies of the initial discharge phase

被引：30

作者：

Betz, H. -D. ^{[1
]}

Marshall, T. C. ^{[6
]}

Stolzenburg, M.

Schmidt, K. ^{[1
]}

Oettinger, W. P. ^{[7
]}

Defer, E. ^{[2
]}

Konarski, J. ^{[4
]}

Laroche, P. ^{[5
]}

Dombai, F. ^{[3
]}

机构：

[1] Univ Munich, Dept Phys, D-80547 Garching, Germany

[2] Observ Paris, LERMA, F-75014 Paris, France

[3] Hungarian Meteorol Serv, H-1181 Budapest, Hungary

[4] Inst Meteorol & Water Management, PL-01673 Warsaw, Poland

[5] Off Natl Etud & Rech Aerosp, F-92322 Chatillon, France

[6] Univ Mississippi, Dept Phys & Astron, University, MS 38677 USA

[7] Nowcast GmbH, D-81377 Munich, Germany

来源：

GEOPHYSICAL RESEARCH LETTERS | 2008年 / 35卷 / 23期

关键词：

D O I：

10.1029/2008GL035820

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Lightning initiation and the associated in-cloud parts of lightning flashes have been studied by comparing thunderstorm data from two independent networks, LINET and SAFIR-type systems, operating in the VLF/LF and VHF regime, respectively. The two networks respond to radiation pulses with different length scales; an event detected by VLF/LF must be hundreds of meters long. In all 12 storms studied, up to half of the first in-cloud events detected with the VHF networks were found to be closely time-correlated with the first VLF/LF signal. Range-normalized VLF/LF signal amplitudes of the time-coincident events (TCEs) are comparable to amplitudes of weak cloud-to-ground strokes. Without measured preparatory VHF emission activity, initial breakdown in TCEs seems to start directly with a strong discharge step producing signatures in VLF/LF records. The TCE data are consistent with lightning initiation via a runaway breakdown mechanism that extended over hundreds of meters.

引用

页数：5

共 19 条

[1] Initial leader velocities during intracloud lightning: Possible evidence for a runaway breakdown effect [J].