Runaway electrons from a ‘beam-bulk’ model of streamer:
application to TGFs

J 2014

Runaway electrons from a ‘beam-bulk’ model of streamer: application to TGFs

CHANRION, Olivier, Zdeněk BONAVENTURA, Deniz ÇINAR, Anne BOURDON, Torsten NEUBERT et. al.

Základní údaje

Originální název

Runaway electrons from a ‘beam-bulk’ model of streamer: application to TGFs

Autoři

CHANRION, Olivier (250 Francie), Zdeněk BONAVENTURA (203 Česká republika, garant, domácí), Deniz ÇINAR (250 Francie), Anne BOURDON (250 Francie) a Torsten NEUBERT (250 Francie)

Vydání

Environmental Research Letters, 2014, 1748-9326

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10305 Fluids and plasma physics

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 3.906

Kód RIV

RIV/00216224:14310/14:00076909

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1088/1748-9326/9/5/055003

UT WoS

000339885100011

Klíčová slova anglicky

atmospheric electricity; streamer discharge; TGF; Monte Carlo methods; drift diffusion methods

Štítky

AKR, rivok

Změněno: 17. 4. 2015 10:01, Ing. Andrea Mikešková

Anotace

V originále

The generation of x- and gamma-rays in atmospheric discharges has been studied intensively since the discovery of terrestrial gamma-ray flashes (TGFs) by the Compton gamma-ray Observatory in 1991. Emissions are bremsstrahlung from high energy particles accelerated in large scale atmospheric electric fields associated with thunderstorms. Whereas observations now are many, both from lightning and the laboratory, the phases of the discharge where emissions are generated are still debated and several processes for electron acceleration have been put forward by theorists. This paper address the electron acceleration in streamer region of lightning. We present the first 'beam-bulk' model of self-consistent streamer dynamics and electron acceleration. The model combines a Monte Carlo Collision code that simulates the high-energy electrons (> 100 eV) and a fluid code that simulates the bulk of the low-energy electrons and ions. For a negative streamer discharge, we show how electrons are accelerated in the large electric field in the tip of the streamer and travel ahead of the streamer where they ionize the gas. In comparison to the results obtained with a classical fluid model for a negative streamer, the beam-bulk model predicts a decrease of the magnitude of the peak electric field and an increase of the streamer velocity. Furthermore, we show that a significant number of runaway electrons is lost by diffusion outside of the streamer tip. The results presented here do not yet include extra amplification nor acceleration far away from the streamer to explain the electron energies seen in TGFs. Still, in the light of those results, we emphasize that the production of runaway electrons from streamers needs to be simulated including the self-consistent feedback of runaways on the streamer. Simulations with a beam-bulk model may not only help to understand the fundamental atmospheric processes behind TGFs, but also pave the way for the interpretation of remote sensing of the most energetic discharges in the Earth's atmosphere and thus help to address their environmental impact.

Návaznosti

ED2.1.00/03.0086, projekt VaV

Název: Regionální VaV centrum pro nízkonákladové plazmové a nanotechnologické povrchové úpravy

Citovat

CHANRION, Olivier, Zdeněk BONAVENTURA, Deniz ÇINAR, Anne BOURDON a Torsten NEUBERT. Runaway electrons from a ‘beam-bulk’ model of streamer: application to TGFs. Environmental Research Letters. 2014, roč. 9, č. 5, s. "nestrankovano", 9 s. ISSN 1748-9326. Dostupné z: https://dx.doi.org/10.1088/1748-9326/9/5/055003.

@article{1203334,
   author = {Chanrion, Olivier and Bonaventura, Zdeněk and Çinar, Deniz and Bourdon, Anne and Neubert, Torsten},
   article_number = {5},
   doi = {http://dx.doi.org/10.1088/1748-9326/9/5/055003},
   keywords = {atmospheric electricity; streamer discharge; TGF; Monte Carlo methods; drift diffusion methods},
   language = {eng},
   issn = {1748-9326},
   journal = {Environmental Research Letters},
   title = {Runaway electrons from a ‘beam-bulk’ model of streamer: application to TGFs},
   url = {http://iopscience.iop.org/1748-9326/9/5/055003},
   volume = {9},
   year = {2014}
}

TY  - JOUR
ID  - 1203334
AU  - Chanrion, Olivier - Bonaventura, Zdeněk - Çinar, Deniz - Bourdon, Anne - Neubert, Torsten
PY  - 2014
TI  - Runaway electrons from a ‘beam-bulk’ model of streamer: application to TGFs
JF  - Environmental Research Letters
VL  - 9
IS  - 5
SP  - "nestrankovano"
EP  - "nestrankovano"
SN  - 17489326
KW  - atmospheric electricity
KW  - streamer discharge
KW  - TGF
KW  - Monte Carlo methods
KW  - drift diffusion methods
UR  - http://iopscience.iop.org/1748-9326/9/5/055003
L2  - http://iopscience.iop.org/1748-9326/9/5/055003
N2  - The generation of x- and gamma-rays in atmospheric discharges has been studied intensively since the discovery of terrestrial gamma-ray flashes (TGFs) by the Compton gamma-ray Observatory in 1991. Emissions are bremsstrahlung from high energy particles accelerated in large scale atmospheric electric fields associated with thunderstorms. Whereas observations now are many, both from lightning and the laboratory, the phases of the discharge where emissions are generated are still debated and several processes for electron acceleration have been put forward by theorists. This paper address the electron acceleration in streamer region of lightning. We present the first 'beam-bulk' model of self-consistent streamer dynamics and electron acceleration. The model combines a Monte Carlo Collision code that simulates the high-energy electrons (> 100 eV) and a fluid code that simulates the bulk of the low-energy electrons and ions. For a negative streamer discharge, we show how electrons are accelerated in the large electric field in the tip of the streamer and travel ahead of the streamer where they ionize the gas. In comparison to the results obtained with a classical fluid model for a negative streamer, the beam-bulk model predicts a decrease of the magnitude of the peak electric field and an increase of the streamer velocity. Furthermore, we show that a significant number of runaway electrons is lost by diffusion outside of the streamer tip. The results presented here do not yet include extra amplification nor acceleration far away from the streamer to explain the electron energies seen in TGFs. Still, in the light of those results, we emphasize that the production of runaway electrons from streamers needs to be simulated including the self-consistent feedback of runaways on the streamer. Simulations with a beam-bulk model may not only help to understand the fundamental atmospheric processes behind TGFs, but also pave the way for the interpretation of remote sensing of the most energetic discharges in the Earth's atmosphere and thus help to address their environmental impact.
ER  -

CHANRION, Olivier, Zdeněk BONAVENTURA, Deniz $\backslash$C CINAR, Anne BOURDON a Torsten NEUBERT. Runaway electrons from a ‘beam-bulk’ model of streamer: application to TGFs. \textit{Environmental Research Letters}. 2014, roč.~9, č.~5, s.~''nestrankovano'', 9 s. ISSN~1748-9326. Dostupné z: https://dx.doi.org/10.1088/1748-9326/9/5/055003.

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