Properties of Hall-MHD Turbulence at Sub-Ion Scales: Spectral Transfer Analysis

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F21%3A00552260" target="_blank" >RIV/67985815:_____/21:00552260 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68378289:_____/21:00551573

Výsledek na webu

<a href="http://hdl.handle.net/11104/0327390" target="_blank" >http://hdl.handle.net/11104/0327390</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/atmos12121632" target="_blank" >10.3390/atmos12121632</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Properties of Hall-MHD Turbulence at Sub-Ion Scales: Spectral Transfer Analysis

Popis výsledku v původním jazyce

We present results of a multiscale study of Hall-magnetohydrodynamic (MHD) turbulence, carried out on a dataset of compressible nonlinear 2D Hall-MHD numerical simulations of decaying Alfvenic turbulence. For the first time, we identify two distinct regimes of fully developed turbulence. In the first one, the power spectrum of the turbulent magnetic fluctuations at sub-ion scales exhibits a power law with a slope of & SIM,-2.9, typically observed both in solar wind and in magnetosheath turbulence. The second regime, instead, shows a slope of -7/3, in agreement with classical theoretical models of Hall-MHD turbulence. A spectral-transfer analysis reveals that the latter regime occurs when the energy transfer rate at sub-ion scales is dominated by the Hall term, whereas in the former regime, the governing process is the dissipation (and the system exhibits large intermittency). Results of this work are relevant to the space plasma community, as they may potentially reconcile predictions from theoretical models with results from numerical simulations and spacecraft observations.

Název v anglickém jazyce

Properties of Hall-MHD Turbulence at Sub-Ion Scales: Spectral Transfer Analysis

Popis výsledku anglicky

We present results of a multiscale study of Hall-magnetohydrodynamic (MHD) turbulence, carried out on a dataset of compressible nonlinear 2D Hall-MHD numerical simulations of decaying Alfvenic turbulence. For the first time, we identify two distinct regimes of fully developed turbulence. In the first one, the power spectrum of the turbulent magnetic fluctuations at sub-ion scales exhibits a power law with a slope of & SIM,-2.9, typically observed both in solar wind and in magnetosheath turbulence. The second regime, instead, shows a slope of -7/3, in agreement with classical theoretical models of Hall-MHD turbulence. A spectral-transfer analysis reveals that the latter regime occurs when the energy transfer rate at sub-ion scales is dominated by the Hall term, whereas in the former regime, the governing process is the dissipation (and the system exhibits large intermittency). Results of this work are relevant to the space plasma community, as they may potentially reconcile predictions from theoretical models with results from numerical simulations and spacecraft observations.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Atmosphere

ISSN

2073-4433

e-ISSN

2073-4433

Svazek periodika

12

Číslo periodika v rámci svazku

12

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

12

Strana od-do

1632

Kód UT WoS článku

000735809200001

EID výsledku v databázi Scopus

2-s2.0-85121964235