Results 171 to 180 of about 4,370 (195)

Characteristic Pulse Trains of Preliminary Breakdown in Four Isolated Small Thunderstorms

Journal of Geophysical Research D: Atmospheres, 2017
AbstractUsing a low‐frequency six‐station local network, preliminary breakdown (PB) pulses not followed or followed by negative return stroke (RS), which are defined as PB‐type and PB cloud‐to‐ground (PBCG)‐type flashes, are analyzed based on four isolated small thunderstorms for the first time.
Dong Ma
exaly   +2 more sources

Pulse Trains That Are Characteristic of Preliminary Breakdown in Cloud-to-Ground Lightning but Are Not Followed by Return Stroke Pulses [PDF]

Journal of Geophysical Research D: Atmospheres, 2008
In this study, we identify and examine electric field pulse trains that are characteristic of preliminary breakdown in negative cloud‐to‐ground discharges but are not followed by return stroke waveforms. We assume that such trains are manifestations of the initiation of downward negative stepped leaders that fail to propagate all the way to the ground ...
Vladimir A Rakov, Nag, Amitabh
exaly   +2 more sources

Locating Preliminary Breakdown Pulses in Positive Cloud-to-Ground Lightning [PDF]

Journal of Geophysical Research D: Atmospheres, 2018
AbstractThis paper provides the first concrete evidence that preliminary breakdown (PB) pulses of either polarity in positive cloud‐to‐ground (+CG) lightning are produced by negative leaders. Three‐dimensional location results of PB pulses in 46 +CG flashes are analyzed.
Daohong Wang, Ting Wu, Nobuyuki Takagi
exaly   +2 more sources

Preliminary Breakdown Pulses (PBP): A Review on Available Data and Models

Electric Power Systems Research
Lightning is a major risk for humans, animals, and electrical systems. Many researches focused on the fully developed events, such as the Return Stroke (RS) current, the emitted electromagnetic fields, and the phenomenon modeling. However, there is poor understanding regarding precursors, such as Preliminary Breakdown Pulses (PBP).
Martino Nicora, Renato Procopio, Daniele Mestriner   +2 more
exaly   +3 more sources

Comparative Study on Preliminary Breakdown Pulse Trains Observed in Johor, Malaysia and Florida, USA

Atmospheric Research, 2012
In this paper, the preliminary breakdown (PB) pulse train preceding the negative first return stroke (RS) is recorded using a broad band antenna system.
M Fernando
exaly   +2 more sources

Subionospheric Propagation and Peak Currents of Preliminary Breakdown Pulses Before Negative Cloud-to-Ground Lightning Discharges [PDF]

Geophysical Research Letters, 2016
AbstractWe analyze broadband electromagnetic measurements of pulse sequences occurring prior to first return strokes of negative cloud‐to‐ground lightning flashes. Signals generated by lightning discharges were recorded close to the thunderstorm by a magnetic field receiver and traveled up to 600 km to three distant electric field receivers.
Thomas Farges, Steven A. Cummer, Ivana Kolmašová   +2 more
exaly   +3 more sources

Correlation Analysis Between Initial Preliminary Breakdown Process, the Characteristic of Radiation Pulse, and the Charge Structure on the Qinghai-Tibetan Plateau [PDF]

Journal of Geophysical Research D: Atmospheres, 2016
AbstractUsing synchronous data from a three‐dimensional lightning VHF radiation source mapping system, broadband electric field changes, and the radiation intensity of lightning on the Qinghai‐Tibetan Plateau, we divided the preliminary breakdown process into two processes by subdividing the original definition: an initial preliminary breakdown process
Yajun Li, Jun Wen, Tong Zhang
exaly   +2 more sources

Observed Preliminary Breakdown Pulses of Intracloud Discharges

2017 International Conference on High Voltage Engineering and Power Systems (ICHVEPS), 2017
Compact intracloud discharge (CID) pulses have strong radio frequency radiation, large amplitude and a short duration of several microseconds. There are two types of CIDs, namely positive and negative CID. CID electric field signatures appear without any detectable initial breakdown process.
Ariadi Hazmi, Primas Emeraldi
exaly   +2 more sources

Comparison of preliminary breakdown pulses observed in Sweden and in Sri Lanka

Journal of Atmospheric and Solar-Terrestrial Physics, 1998
Abstract In this paper we have analysed breakdown pulse trains preceding the first return stroke in 47 negative cloud-to-ground (CG) lightning flashes observed in Sri Lanka (tropics) and that in 41 negative CG flashes recorded in Sweden (temperate regions). In the data obtained in Sri Lanka, breakdown pulses could be detected only in nine flashes. In
Chandima Gomes, Vernon Cooray, Chandana Jayaratne   +2 more
openaire   +1 more source

Preliminary Breakdown of Intracloud Lightning: Initiation Altitude, Propagation Speed, Pulse Train Characteristics, and Step Length Estimation [PDF]

Journal of Geophysical Research D: Atmospheres, 2015
AbstractUsing a low‐frequency lightning location system comprising 11 sites, we located preliminary breakdown (PB) processes in 662 intracloud (IC) lightning flashes during the summer of 2013 in Osaka area of Japan. On the basis of three‐dimensional location results, we studied initiation altitude and upward propagation speed of PB processes.
Tomoo Ushio, Michael Stock, Satoru Yoshida   +2 more
exaly   +2 more sources