Statistics of magnetic reconnection and turbulence in Hall-MHD and hybrid-PIC simulations

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F19%3A00518682" target="_blank" >RIV/67985815:_____/19:00518682 - isvavai.cz</a>

Výsledek na webu

<a href="http://hdl.handle.net/11104/0303756" target="_blank" >http://hdl.handle.net/11104/0303756</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1393/ncc/i2019-19023-0" target="_blank" >10.1393/ncc/i2019-19023-0</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Statistics of magnetic reconnection and turbulence in Hall-MHD and hybrid-PIC simulations

Popis výsledku v původním jazyce

Properties of decaying Alfvenic plasma turbulence are investigated by means of two-dimensional Hall-magnetohydrodynamic and hybrid particle-in-cell numerical simulations. In most cases, spectral properties of turbulent fluctuations find good agreement in both the numerical models. The power spectra of the magnetic field exhibit a double power-law with spectral index -5/3 at large, fluid scales and -3 at sub-ion scales, while for velocity fluctuations the spectral index at fluid scales is -3/2. In both models, the development of a turbulent cascade is concurrently characterized by magnetic reconnection events that are fast, with inverse reconnection rates much smaller than the characteristic large-eddy turnover times. Moreover, these reconnection events trigger a direct energy transfer from large to sub-ion scales. This supports the existence of a reconnection-mediated turbulent regime at sub-ion scales. We conclude that the Hall-MHD fluid description captures to a large extent the transition of the turbulent cascade between the fluid and sub-ion scales.

Název v anglickém jazyce

Statistics of magnetic reconnection and turbulence in Hall-MHD and hybrid-PIC simulations

Popis výsledku anglicky

Properties of decaying Alfvenic plasma turbulence are investigated by means of two-dimensional Hall-magnetohydrodynamic and hybrid particle-in-cell numerical simulations. In most cases, spectral properties of turbulent fluctuations find good agreement in both the numerical models. The power spectra of the magnetic field exhibit a double power-law with spectral index -5/3 at large, fluid scales and -3 at sub-ion scales, while for velocity fluctuations the spectral index at fluid scales is -3/2. In both models, the development of a turbulent cascade is concurrently characterized by magnetic reconnection events that are fast, with inverse reconnection rates much smaller than the characteristic large-eddy turnover times. Moreover, these reconnection events trigger a direct energy transfer from large to sub-ion scales. This supports the existence of a reconnection-mediated turbulent regime at sub-ion scales. We conclude that the Hall-MHD fluid description captures to a large extent the transition of the turbulent cascade between the fluid and sub-ion scales.

Druh

J_ost - Ostatní články v recenzovaných periodicích

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Nuovo Cimento

ISSN

1826-9885

e-ISSN

—

Svazek periodika

42

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

IT - Italská republika

Počet stran výsledku

4

Strana od-do

23

Kód UT WoS článku

000477658400003

EID výsledku v databázi Scopus

2-s2.0-85068539835