Experimental Radial Profiles of Early Time (&lt;4 μs) Neutral and Ion Spectroscopic Signatures in Lightning‐Like Discharges

Passas-Varo, María; Gordillo‐Vázquez, F. J.; Sánchez, Javier; Kieu, N.

doi:10.1029/2022jd036553

Cited by 3 publications

(2 citation statements)

References 49 publications

(145 reference statements)

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“…Using GALIUS, Passas‐Varo et al. (2022) performed radial‐resolved spectroscopy of laboratory‐generated lightning‐like discharges in air, finding the radial profiles of the electron/gas temperature (10,000–34,000 K) and electron density (2 × 10 16 cm −3 to 2 × 10 18 cm −3 ). Kieu et al.…”

Section: Introductionmentioning

confidence: 99%

“…Kieu et al (2020) recorded sub microsecond high-resolution time-resolved spectra (645-665 nm) in laboratory-produced lightning-like discharges using the GrAnada LIghtning Ultrafast Spectrograph (GALIUS), and reported the maximum electron density and gas temperature. Using GALIUS, Passas-Varo et al (2022) performed radial-resolved spectroscopy of laboratory-generated lightning-like discharges in air, finding the radial profiles of the electron/gas temperature (10,000-34,000 K) and electron density (2 × 10 16 cm 3 to 2 × 10 18 cm 3 ). Kieu et al (2021) investigated electron densities and temperatures derived from different sets of neutral and ionic lines.…”

Section: Introductionmentioning

confidence: 99%

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Spectral Study of Rare Upward Developing, Circling, and Branching Cloud‐To‐Ground Lightning

Xu,

Gou,

Yuan

et al. 2024

JGR Atmospheres

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The development of cloud‐to‐ground (CG) lightning channel is one of the main bases reflecting the discharge characteristics. Time‐resolved spectra of CG lightning with eight return strokes were recorded by a slit‐less high‐speed spectroscope. We found an unusual phenomenon in which a branch developed upward from a node following a circling structure into the cloud after the first return stroke. To investigate the propagation properties of this lightning, characteristic parameters such as the two‐dimensional speed of the leader, node temperature, and electron density are analyzed. The physical mechanism of the branch is discussed. Spectral analysis reveals that the main channel temperature and electron density are approximately 2.72–3.07 × 104 K and 0.23–2.03 × 1018 cm−3, respectively. The temperature and electron density increase as the branch approaches the cloud base, similar to the feature of the main channel approaching the ground. The temperature and electron density of the node are higher than at other locations in the circular channel, indicating that massive charge accumulated around the node. Lightning occurred in the Qilian Mountains in a complex landscape, which easily yielded an uneven distribution in the local electric field of the air, resulting in channel bending, kinking, and even circle development. The phenomenon of the branch developed from the node to the cloud may be due to the fact that the branch is formed during the return stroke process.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Spectral Study of Rare Upward Developing, Circling, and Branching Cloud‐To‐Ground Lightning

Xu,

Gou,

Yuan

et al. 2024

JGR Atmospheres

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Experimental Radial Profiles of Early Time (<4 μs) Neutral and Ion Spectroscopic Signatures in Lightning‐Like Discharges

et al. 2022

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Breakdown Time Phenomena: Analyzing the Conductive Channel of Positive Impulse Voltage Discharges under Standard Temperature and Pressure Air Conditions

Ikhwanus,

Morimoto

2024

Energies

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Even though the streamer process can be identified in nanoseconds and microseconds through experimental measurements, the breakdown time of air discharge is still unknown. The instability of electrons is suspected to be an attachment-instability phenomenon of the channel conductivity. We investigated breakdown time across milliseconds to better understand how the oxygen excitations of the 200–400 nm range influence a high-conductivity channel even with a weaker applied voltage. Experiments were performed with positive impulse voltages ranging from +42 to +75 kV in the step of +6 kV at a 3 cm gap between needle-to-plane electrodes in a horizontal configuration. A spectrometer with an integration time of 70 ms was used to capture the spectra during voltage discharge. The shortest breakdown time was found at +60 kV with 77 ns compared to +66, +72, and +75 kV. We conclude that the shorter breakdown time at +60 kV is primarily due to the oxygen-excited state in O IV at 262.999 nm. This state helps maintain electron flow by preventing electron loss, with a decay time of 2.5 µs, while releasing Joule heat at a temperature of 26,003 K, which optimizes conductivity. This process occurs before the recombination of the O I line at 777.417 nm, which has a significantly shorter decay time of 27 ns.

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Experimental Radial Profiles of Early Time (<4 μs) Neutral and Ion Spectroscopic Signatures in Lightning‐Like Discharges

Abstract: Slitless spectroscopy is a well known technique to analyze the absortion and emission of light coming from a narrow source, that consists of an optical system including a diffraction element and a sensor. It is a very useful tool to analyze the spectrum of natural (

Cited by 3 publications

References 49 publications

Spectral Study of Rare Upward Developing, Circling, and Branching Cloud‐To‐Ground Lightning

Spectral Study of Rare Upward Developing, Circling, and Branching Cloud‐To‐Ground Lightning

Experimental Radial Profiles of Early Time (<4 μs) Neutral and Ion Spectroscopic Signatures in Lightning‐Like Discharges

Breakdown Time Phenomena: Analyzing the Conductive Channel of Positive Impulse Voltage Discharges under Standard Temperature and Pressure Air Conditions

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