Propagation of the positive streamer-leader system in a 16.7 m rod-plane gap

Domens, P.; Gibert, A.; Dupuy, J.; Hutzler, B.

doi:10.1088/0022-3727/24/10/009

Cited by 49 publications

(35 citation statements)

References 6 publications

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“…In a negative stepped leader, the step optical pulse is produced when the leader tip connects into a backward leader initiated from a space stem [e.g., Les Renardieres Group , 1981; Biagi et al , 2009], although how the space stem is initiated remains unknown. In a positive stepped leader, it seems that no such space stems exist [e.g., Domens et al , 1991] and how the abrupt discharges occur is not known.…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

A downward positive leader that radiated optical pulses like a negative stepped leader

Wang¹,

Takagi²

2011

J. Geophys. Res.

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[1] Using a high-speed optical imaging system (Automatic Lightning Progressing Feature Observation System (ALPS)) operated at a time resolution of 100 ns, we recorded a downward positive leader that radiated more than 20 optical pulses during its downward progression over the height from 299 m to 21 m above the ground like a negative stepped leader. The leader propagated at a speed of around 1.0 × 10 6 m/s over the height from 272 m to 93 m and then accelerated to a speed of 2.5 × 10 6 m/s at the height of about 45 m. The positive leader pulses show a 10-90% risetime ranging from 1.2 to 3.8 ms with a geometric mean (GM) value of 2.0 ms, and a half-peak width ranging from 1.8 to 5.1 ms with a GM value of 3.4 ms. On average, the GM risetime and GM half-peak width of these positive leader pulses are about 5 times (2.0 ms versus 0.4 ms) and 3 times (3.4 ms versus 1.1 ms) larger, respectively, than those of negative leader pulses. The step luminosity pulses apparently originate in the leader tip region, which is unresolved with our limited spatial resolution of about 25 m, and propagate upward over distances from several tens of meters to more than 200 m (undetectable beyond that distance) with a speed close to 1.0 × 10 8 m/s. The pulses appear to attenuate significantly during their initial upward propagation of several tens of meters and then exhibit a tendency to be more or less constant in their luminosity.Citation: Wang, D., and N. Takagi (2011), A downward positive leader that radiated optical pulses like a negative stepped leader,

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Section: Discussion and Concluding Remarksmentioning

confidence: 99%

A downward positive leader that radiated optical pulses like a negative stepped leader

Wang¹,

Takagi²

2011

J. Geophys. Res.

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“…This overvoltage for U 50% value was obtained following the semi-empirical formula proposed by Paris [1], where the U 50% can be estimated from the gap distance for the rod-to-plane configuration tested with positive switching-like voltage impulses follows the relation (1): U 50% = 500*d 0. 6 (1)…”

Section: Voltage and Current Recordsmentioning

confidence: 99%

“…The development of equipment operative at higher voltages is continuous, where testing and simulating have become a great tool for the designers. Most of the tests involve high voltage lightning-or switching-like impulses applied to different electrode configurations, representing most of the constructive possibilities, aiming to find the 50% probability breakdown voltage (U 50% ) [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of leader tortuosity and velocity in long rod-plane air discharges

Díaz

Hettiarachchi

Rahman

et al. 2016

IEEE Trans. Dielect. Electr. Insul.

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Long air gap electrical discharges are of particular interest among scientists and engineers working on high voltage techniques and lightning research. In the present work we report experimental results obtained while testing a long rod-plane air gap with positive switching-like voltage impulses to study the velocity and tortuous progression of the leader discharge. Voltage and current waveforms were recorded. Two still digital cameras were used to track the leader tortuous path. By using a fast digital camera, the leader temporal evolution was recorded and its propagation velocity was estimated. Three angles were used to describe the leader tortuous progression.

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“…5 (a, b) Positive streamer patterns growing from an anode in 8/4-cm gaps at atmospheric pressure and applied voltages U a = 60/54-kV (adapted from Briels et al 2006). (c, d) Examples of positive leaders (adapted from R07/ Domens et al 1991). Reprinted by permission from the IOP Publishing Ltd. and American Geophysical Union E th const.…”

Section: Basics Of Transient Dischargesmentioning

confidence: 99%

“…For positive leaders in a ∼17-m gap under voltages 2.3-2.4 MV, three types of propagation were documented: continuous (c), oscillatory (o), and restrike (r) (Domens et al 1991). That the average field in the gap E a ≈ 1.4 kV/cm is well below E (+) s indicates that the high potential is transferred along the gap by the conductive leader.…”

Section: Basics Of Transient Dischargesmentioning

confidence: 99%

Blue Jets: Upward Lightning

Mishin

Milikh

2008

Space Sci Rev

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Blue jets are beams of blue light propagating from the tops of active thunderclouds up to altitudes of ∼50 km. They resemble tall trees with quasi-vertical trunk and filamentary branches. Their apparent speeds are in the range of 10 s to 100 s km/s. Other events, having essentially lower terminal altitudes (<26 km), are named blue starters. These phenomena represent the first documented class of upward electrical discharges in the stratosphere. Some of upward discharges, termed gigantic jets, propagate into the lower ionosphere at much higher speeds in the final phase. We describe salient features of the upward discharges in the atmosphere, give an assessment of the theories of their development, and discuss the consequences for the electrodynamics and chemistry of the stratosphere. We argue that this upward lightning phenomenon can be understood in terms of the bidirectional leader, emerging from the anvil.

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Propagation of the positive streamer-leader system in a 16.7 m rod-plane gap

Cited by 49 publications

References 6 publications

A downward positive leader that radiated optical pulses like a negative stepped leader

A downward positive leader that radiated optical pulses like a negative stepped leader

Experimental study of leader tortuosity and velocity in long rod-plane air discharges

Blue Jets: Upward Lightning

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