Characteristics of the discharge of a charged dielectric in low-pressure air

Robledo‐Martinez, A.; Garcia-Villarreal, A.; Palacios, Gonzalo Vázquez; Vera, A.; Sobral, H.

doi:10.1016/j.elstat.2015.05.021

Cited by 5 publications

(8 citation statements)

References 13 publications

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“…This is the time it takes to lower the pressure in the chamber from~500 to 0.03 torr. The initial surface charge density σ was of the order of 1 μC/m 2 , and at any moment the remaining charge density on the dielectric was found to fit (as reported in Robledo-Martinez et al [2015]):…”

Section: Discharge Typesmentioning

confidence: 78%

“…The initial surface charge density σ was of the order of 1 μC/m 2 , and at any moment the remaining charge density on the dielectric was found to fit (as reported in Robledo‐Martinez et al . []):

σ = 3.5 \times 10^{prefix- 8} p^{0.58} ((), normalC m^{prefix- 2})

where p is the pressure in torr. The corresponding rate of charge loss as a function of time t (in minutes) was d σ /d t = −2.767 × 10 −7 exp(− t /2.9346) (C m −2 /min).…”

Section: Resultsmentioning

confidence: 99%

“…Once the charge process ended the wire was withdrawn toward the bottom of the chamber, the vacuum pump started, and the discharge sequence commenced. For more details on the experimental setup, see Robledo-Martinez et al [2015].…”

Section: Methodsmentioning

confidence: 99%

“…In a previous investigation carried out by our group [ Robledo‐Martinez et al ., ] it was found that a dielectric charged with negative polarity emitted blue jets when the ambient pressure was lowered to values in the range 17–100 torr. The aim of this paper is to investigate the same type of discharge under positive polarity, at even lower pressures, in order to explore for possible similarities with sprite discharges.…”

Section: Introductionmentioning

confidence: 99%

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Comparison between low‐pressure laboratory discharges and atmospheric sprites

2017

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The discharge of a charged dielectric in low‐pressure air has characteristics that resemble some of the features of mesospheric discharges. The dielectric discharges in steps when the pressure of the surrounding air is gradually reduced from nearly atmospheric to ~0.01 torr. The setup employed here decouples the discharge from the power supply, and, thanks to that, unique properties of the discharge manifest themselves. For example, in the pressure interval ~10–100 torr streamers are emitted from the surface of the dielectric but when the pressure decreases to 2–16 torr these are replaced by spherically symmetrical discharges that we call peonies. These have interesting properties, like (a) they do not produce electrical field, (b) they remain static, and (c) their size increases with decreasing pressure. The peonies are a type of discharge that has not been reported before. They resemble sprite beads and are assumed to consist of large avalanches that do not lead to the formation of a streamer. At further lower pressures, in the interval 0.01–0.1 torr, diffuse volume discharges were observed that have some morphological similarities with sprite halos and the top of columnar sprites. The spectrographic measurements carried out show that the discharges have bands from the first and second positive systems in N2 as well as lines of N2+. Quenching of the first negative system of N2 was observed at 3 torr. In this work it was also observed how a cosmic ray can go on to trigger a discharge inside the experimentation chamber.

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Section: Discharge Typesmentioning

confidence: 78%

σ = 3.5 \times 10^{prefix- 8} p^{0.58} ((), normalC m^{prefix- 2})

where p is the pressure in torr. The corresponding rate of charge loss as a function of time t (in minutes) was d σ /d t = −2.767 × 10 −7 exp(− t /2.9346) (C m −2 /min).…”

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparison between low‐pressure laboratory discharges and atmospheric sprites

2017

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“…Modern research [ 11 , 12 , 13 , 14 , 15 ] concentrates mainly on the electrification of the clouds themselves (including assumptions on the future/possible numerical models), electrification and discharges on plastics, and the occurrence and properties of lightning strikes on aircraft (natural, artificial, and model setups). The acquisition and loss of electric charge in aircraft was addressed in Reference [ 15 ]; however, no cloud-related mechanisms were presented, as the major focus was on the inception of lightning.…”

Section: Introductionmentioning

confidence: 99%

In-Flight Electromagnetic Compatibility of Airborne Vertical VLF Antennas

Miś

Modelski

2022

Sensors

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Long-wire very low frequency antennas, when lifted up on high altitudes by an aerostat, move through different atmospheric layers and interact with them electrically in a more intense way in comparison with aircraft flights. Such interactions manifest themselves in the form of electrical changes in the clouds and corona discharges excited on the antenna wire, which may increase the risk of mechanical damages and transmitter overload. In order to investigate the interactions between the different types of clouds and a long balloon-borne antenna wire, two theoretical models were developed and compared with results from an experimental balloon flight directly through a storm front. Based on the theoretical and experimental results, the most accurate model proposed was chosen, as well as a set of basic requirements for the balloon-borne VLF antenna system, reducing the risk of failure during operation in highly electrically active atmospheric environments.

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Virtual anode effect in the propagation of positive streamers

Robledo‐Martinez

Garcia-Villarreal

2016

Physics of Plasmas

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Experiments made in a parallel-plate arrangement, where one of the plates is the ground plane and the other a positively charged dielectric sheet, show that at low air pressure the dielectric injects streamers onto the surrounding air. The similarities and differences between the streamers thus produced and those emitted from electrodes are discussed. The streamers here obtained were found to have diameters and speeds that are clearly dependent on pressure. Often the streamers were seen to decelerate markedly to the point of coming to a complete stop and on occasions even returning back to the dielectric they came from. The deceleration and the reflection of the streamers are attributed to a virtual anode created by the electrostatic image of the head's charge behind the ground plane. Field calculations performed corroborate this hypothesis. Through the use of an equation of motion of the positive head, it is then possible to obtain an estimate of the magnitude of its charge. The charge thus obtained was found to be in the 2.5–26 nC range.

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Characteristics of the discharge of a charged dielectric in low-pressure air

Cited by 5 publications

References 13 publications

Comparison between low‐pressure laboratory discharges and atmospheric sprites

Comparison between low‐pressure laboratory discharges and atmospheric sprites

In-Flight Electromagnetic Compatibility of Airborne Vertical VLF Antennas

Virtual anode effect in the propagation of positive streamers

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