Optical Signatures Associated With Streamers and Leaders of Laboratory Discharges

Arcanjo, Marcelo; Montanyà, Joan; Urbani, Michele; Lorenzo, Victor

doi:10.1029/2021gl095601

Cited by 9 publications

(10 citation statements)

References 39 publications

(64 reference statements)

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“…Figure 4c presents the corresponding time-resolved UV emission signals of the different sections of the discharge channel. As expected, all three streamer bursts produce pulsed UV irradiance (Arcanjo et al, 2021). However, the UV emission detected during the dark periods was about two orders of magnitude smaller than that measured during the preceding streamer burst.…”

Section: Resultssupporting

confidence: 80%

“…Due to the intrinsic experimental limitations (e.g., sensitivity) when observing dark periods occurring during natural lightning, research on this subject has focused on dark periods taking place in the laboratory. Observe that only until recently, the electric fields, corona discharge currents, and streamer morphology under outdoor thunderstorms were observed by Arcanjo et al (2021). It was found that the frequency of corona streamer bursts (i.e., the duration of dark periods) is correlated with the ambient electric field for the first time.…”

Section: Plain Language Summarymentioning

confidence: 99%

“…Observe that only until recently, the electric fields, corona discharge currents, and streamer morphology under outdoor thunderstorms were observed by Arcanjo et al. (2021). It was found that the frequency of corona streamer bursts (i.e., the duration of dark periods) is correlated with the ambient electric field for the first time.…”

Section: Introductionmentioning

confidence: 98%

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Ionization Activity Detected During Dark Periods in Long Air Positive Sparks

Zhao

Becerra

Wang³

et al. 2023

JGR Atmospheres

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The time duration when no ionization activity is detectable during consecutive, separate positive streamer corona bursts in long air gap experiments is generally referred to as the dark period (Gallimberti, 1979). The dark period is explained by the reduction of the electric field around the highly stressed positive electrode by the space charge left behind after a streamer stops propagating (Les Renardières Group, 1974). This electrostatic shielding effect has been assumed to inhibit the further development of ionization, usually detected in camera images as a dark period without visible illumination. However, if the applied voltage continues increasing, the electric field distribution will also augment until a new streamer is again initiated, ending the dark period. It can take place multiple times both before and after the initiation of a stable positive leader discharge, when it is referred to as the primary or the secondary dark period respectively (Carrara & Thione, 1976). Observe that the dark period that

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Section: Resultssupporting

confidence: 80%

Section: Plain Language Summarymentioning

confidence: 99%

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Ionization Activity Detected During Dark Periods in Long Air Positive Sparks

Zhao

Becerra

Wang³

et al. 2023

JGR Atmospheres

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“…The photometers measure the second positive line of N 2 at 337 nm with a bandwidth of 5 nm (blue), part of the N 2 Lyman‐Birge‐Hopfield (LBH) band at 180–235 nm (UV), and a line of atomic oxygen OI at 777.4 nm with 3 nm bandwidth (red). The red line is strong in lightning leader emissions and the blue line is emitted both by leaders and streamers (Arcanjo et al., 2021). The cameras measure in the blue and red bands with a spatial resolution of ∼400 m at sea level toward nadir.…”

Section: The Observationsmentioning

confidence: 99%

Observations of Blue Corona Discharges in Thunderclouds

Husbjerg

Neubert

Chanrion

et al. 2022

Geophysical Research Letters

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Streamers are a type of electrical discharge characterized by a filament of weakly ionized plasma propagating as an ionisation wave. A multitude of streamers may be launched, for instance, from lightning leader tips, where their optical emissions form a corona. They pre-ionize and condition the atmosphere ahead of a lightning leader, assisting its continued propagation (Ebert et al., 2010;Raizer, 1980). Flashes of light from thunderstorm clouds have been observed in the second positive band of Nitrogen (N 2 2P) at 337 nm (blue) with no emission in the main lightning leader lines of OI at 777.4 nm (red), suggesting they are made of streamer breakdown. They are observed in the upper regions of clouds, with some at the very top (

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“…The photometers measure the second positive line of N 2 at 337 nm with a bandwidth of 5 nm (blue), part of the N 2 Lyman-Birge-Hopfield (LBH) band at 180-235 nm (UV), and a line of atomic oxygen OI at 777.4 nm with 3 nm bandwidth (red). The red line is strong in lightning leader emissions and the blue line is emitted both by leaders and streamers (Arcanjo et al, 2021). The cameras measure in the blue and red bands with a spatial resolution of ∼400 m at sea level toward nadir.…”

Section: The Observationsmentioning

confidence: 99%

Observations of Blue Corona Discharges in Thunderclouds

Husbjerg

Neubert

Chanrion³

et al. 2022

Preprint

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Optical Signatures Associated With Streamers and Leaders of Laboratory Discharges

Cited by 9 publications

References 39 publications

Ionization Activity Detected During Dark Periods in Long Air Positive Sparks

Ionization Activity Detected During Dark Periods in Long Air Positive Sparks

Observations of Blue Corona Discharges in Thunderclouds

Observations of Blue Corona Discharges in Thunderclouds

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