Constraining Alfvénic turbulence with helicity invariants | Zendy

S. M. Mahajan | Zendy; Manasvi Lingam | Zendy

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Constraining Alfvénic turbulence with helicity invariants

Author(s) -

S. M. Mahajan,

Manasvi Lingam

Publication year - 2020

Publication title -

monthly notices of the royal astronomical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.058

H-Index - 383

eISSN - 1365-8711

pISSN - 0035-8711

DOI - 10.1093/mnras/staa1318

Subject(s) - physics , equipartition theorem , helicity , turbulence , magnetic helicity , magnetohydrodynamics , kinetic energy , dynamo , scale (ratio) , turbulence kinetic energy , statistical physics , k omega turbulence model , classical mechanics , theoretical physics , magnetic field , mechanics , particle physics , quantum mechanics

In this paper, we study the constraints imposed by the invariants (generalized helicities and energy) of extended magnetohydrodynamics on some global characteristics of turbulence. We show that the global turbulent kinetic and magnetic energies will approach equipartition only under certain circumstances that depend on the ratio of the generalized helicities. In systems with minimal thermal energy, we demonstrate that the three invariants collectively determine the characteristic length scale associated with Alfvenic turbulence.

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