Expansion of Hot Plasma with Kappa Distribution into Cold
Plasma

J 2020

Expansion of Hot Plasma with Kappa Distribution into Cold Plasma

BENÁČEK, Jan a Marian KARLICKY

Základní údaje

Originální název

Expansion of Hot Plasma with Kappa Distribution into Cold Plasma

Autoři

BENÁČEK, Jan a Marian KARLICKY

Vydání

Astrophysical Journal, Bristol, IOP Publishing, 2020, 0004-637X

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 5.877

Kód RIV

RIV/00216224:14310/20:00116772

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.3847/1538-4357/ab89a5

UT WoS

000540822700001

EID Scopus

2-s2.0-85091221500

Klíčová slova anglicky

Plasma astrophysics; Space plasmas; Solar flares; Computational methods; Radio bursts; Solar radio emission; Solar x-ray emission

Štítky

14312040, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 30. 4. 2021 18:30, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

The X-ray emission of coronal flare sources can be explained by considering the kappa electron distribution. Motivated by this fact, we study the problem of how hot plasma with the kappa distribution of electrons is confined in these sources. For comparison, we analyze the same problem, but with the Maxwellian distribution. We use a 3D particle-in-cell code, which is large in one direction and thus effectively only one-dimensional, but describe all electromagnetic effects. In the case with the Maxwellian distribution, and in agreement with the previous studies, we show a formation of the double layer at the hot-cold transition region that suppresses the flux of hot electrons from hot plasma into the cold one. In the case with the kappa distribution, contrary to the Maxwellian case, we found that there are several fronts with the double layers in the hot-cold transition region. It is caused by a more extended tail in the kappa case than in the Maxwellian one. The electrons from the extended tail freely escape from the hot plasma into a cold one. They form a beam that generates the return current and also Langmuir turbulence, where Langmuir waves accumulated at some locations. At these locations, owing to the ponderomotive force, Langmuir waves generate density depressions, where the double layers with the thermal fronts that suppress the hot electron flux, are formed. We also show how protons accelerate in these processes. Finally, we compare the Kappa and Maxwellian cases and discuss how these processes could be observed.

Návaznosti

LM2015085, projekt VaV

Název: CERIT Scientific Cloud (Akronym: CERIT-SC)

Investor: Ministerstvo školství, mládeže a tělovýchovy ČR, CERIT Scientific Cloud

90042, velká výzkumná infrastruktura

Název: CESNET II

90070, velká výzkumná infrastruktura

Název: IT4Innovations

Citovat

BENÁČEK, Jan a Marian KARLICKY. Expansion of Hot Plasma with Kappa Distribution into Cold Plasma. Astrophysical Journal. Bristol: IOP Publishing, 2020, roč. 896, č. 1, s. 1-11. ISSN 0004-637X. Dostupné z: https://doi.org/10.3847/1538-4357/ab89a5.

@article{1687942,
   author = {Benáček, Jan and Karlicky, Marian},
   article_location = {Bristol},
   article_number = {1},
   doi = {https://doi.org/10.3847/1538-4357/ab89a5},
   keywords = {Plasma astrophysics; Space plasmas; Solar flares; Computational methods; Radio bursts; Solar radio emission; Solar x-ray emission},
   language = {eng},
   issn = {0004-637X},
   journal = {Astrophysical Journal},
   title = {Expansion of Hot Plasma with Kappa Distribution into Cold Plasma},
   url = {https://doi.org/10.3847/1538-4357/ab89a5},
   volume = {896},
   year = {2020}
}

TY  - JOUR
ID  - 1687942
AU  - Benáček, Jan - Karlicky, Marian
PY  - 2020
TI  - Expansion of Hot Plasma with Kappa Distribution into Cold Plasma
JF  - Astrophysical Journal
VL  - 896
IS  - 1
SP  - 1-11
EP  - 1-11
PB  - IOP Publishing
SN  - 0004637X
KW  - Plasma astrophysics
KW  - Space plasmas
KW  - Solar flares
KW  - Computational methods
KW  - Radio bursts
KW  - Solar radio emission
KW  - Solar x-ray emission
UR  - https://doi.org/10.3847/1538-4357/ab89a5
L2  - https://doi.org/10.3847/1538-4357/ab89a5
N2  - The X-ray emission of coronal flare sources can be explained by considering the kappa electron distribution. Motivated by this fact, we study the problem of how hot plasma with the kappa distribution of electrons is confined in these sources. For comparison, we analyze the same problem, but with the Maxwellian distribution. We use a 3D particle-in-cell code, which is large in one direction and thus effectively only one-dimensional, but describe all electromagnetic effects. In the case with the Maxwellian distribution, and in agreement with the previous studies, we show a formation of the double layer at the hot-cold transition region that suppresses the flux of hot electrons from hot plasma into the cold one. In the case with the kappa distribution, contrary to the Maxwellian case, we found that there are several fronts with the double layers in the hot-cold transition region. It is caused by a more extended tail in the kappa case than in the Maxwellian one. The electrons from the extended tail freely escape from the hot plasma into a cold one. They form a beam that generates the return current and also Langmuir turbulence, where Langmuir waves accumulated at some locations. At these locations, owing to the ponderomotive force, Langmuir waves generate density depressions, where the double layers with the thermal fronts that suppress the hot electron flux, are formed. We also show how protons accelerate in these processes. Finally, we compare the Kappa and Maxwellian cases and discuss how these processes could be observed.
ER  -

BENÁČEK, Jan a Marian KARLICKY. Expansion of Hot Plasma with Kappa Distribution into Cold Plasma. \textit{Astrophysical Journal}. Bristol: IOP Publishing, 2020, roč.~896, č.~1, s.~1-11. ISSN~0004-637X. Dostupné z: https://doi.org/10.3847/1538-4357/ab89a5.

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