Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Zhou, Hongzhe"'
Autor:
Zhou, Hongzhe, Jingade, Naveen
Nonhelical turbulence within a linear shear flow has demonstrated efficient amplification of large-scale magnetic fields in numerical simulations, but its precise mechanism remains elusive. The incoherent $\alpha$ mechanism proposes that a zero-mean
Externí odkaz:
http://arxiv.org/abs/2401.15860
Autor:
Zhou, Hongzhe
The dynamics of accreting and outgoing flows around compact objects depends crucially on the strengths and configurations of the magnetic fields therein, especially of the large-scale fields that remain coherent beyond turbulence scales. Possible ori
Externí odkaz:
http://arxiv.org/abs/2309.15565
Autor:
Zhou, Hongzhe, Blackman, Eric
Understanding large-scale magnetic field growth in astrophysical objects is a persistent challenge. We tackle the long-standing question of how much helical large-scale dynamo growth occurs independent of the magnetic Reynolds number (Rm) in a closed
Externí odkaz:
http://arxiv.org/abs/2302.06042
Publikováno v:
Mon. Not. Roy. Astron. Soc. 518, 3312-3325 (2023)
The magnetic fields in galaxy clusters and probably also in the interstellar medium are believed to be generated by a small-scale dynamo. Theoretically, during its kinematic stage, it is characterized by a Kazantsev spectrum, which peaks at the resis
Externí odkaz:
http://arxiv.org/abs/2207.09414
The Saffman helicity invariant of Hosking and Schekochihin (2021, PRX 11, 041005), which we here call the Hosking integral, has emerged as an important quantity that may govern the decay properties of magnetically dominated nonhelical turbulence. Usi
Externí odkaz:
http://arxiv.org/abs/2206.07513
Autor:
Zhou, Hongzhe, Blackman, Eric G.
The shear-current effect (SCE) of mean-field dynamo theory refers to the combination of a shear flow and a turbulent coefficient $\beta_{21}$ with a favorable negative sign for exponential mean-field growth, rather than positive for diffusion. There
Externí odkaz:
http://arxiv.org/abs/2104.11112
Autor:
Zhou, Hongzhe, Blackman, Eric G.
Despite spatial and temporal fluctuations in turbulent astrophysical systems, mean-field theories can be used to describe their secular evolution. However, observations taken over time scales much shorter than dynamical time scales capture a system i
Externí odkaz:
http://arxiv.org/abs/2012.06807
Autor:
Zhou, Hongzhe, Blackman, Eric G.
The buildup of small-scale magnetic helicity which accompanies the oppositely signed growth on large scales is central to conventional dynamical quenching theories of mean-field dynamos. However, the conventional formalism presumes isotropic turbulen
Externí odkaz:
http://arxiv.org/abs/1905.01256
Autor:
Zhou, Hongzhe, Blackman, Eric G.
Transport coefficients in turbulence are comprised of correlation functions between turbulent fluctuations and efficient methods to calculate them are desirable. For example, in mean field dynamo theories used to model the growth of large scale magne
Externí odkaz:
http://arxiv.org/abs/1810.07266
Publikováno v:
Journal of Plasma Physics, 84(3) (2018)
Mean field electrodynamics (MFE) facilitates practical modeling of secular, large scale properties of astrophysical or laboratory systems with fluctuations.Practitioners commonly assume wide scale separation between mean and fluctuating quantities, t
Externí odkaz:
http://arxiv.org/abs/1710.04064