Particle Heating by Nonlinear Alfvenic Turbulence in Advection‐dominated Accretion Flows | Zendy

Mikhail V. Medvedev | Zendy

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Particle Heating by Nonlinear Alfvenic Turbulence in Advection‐dominated Accretion Flows

Author(s) -

Mikhail V. Medvedev

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/309449

Subject(s) - physics , turbulence , energy cascade , advection , magnetohydrodynamics , electron , nonlinear system , magnetic reconnection , magnetohydrodynamic turbulence , instability , shearing (physics) , accretion (finance) , cascade , amplitude , astrophysics , magnetic field , mechanics , computational physics , nuclear physics , quantum mechanics , thermodynamics , chemistry , chromatography

Particle heating in advection-dominated accretion flows (ADAFs) by nonlinearMHD (Alfvenic) turbulence is investigated. Such turbulence withhighly-fluctuating magnetic fields, $\tilde B\sim B_0$, is believed to benaturally produced by the magnetic shearing instability near the nonlinearsaturation. It is shown that the energy is dissipated in the parallel cascade,which occurs due to nonlinear compressibility of high-amplitude turbulence, andpredominantly heats protons, but not electrons. The conservative limit on theelectron--to--proton heating fraction is $\delta\lesssim{\rmfew}\times10^{-2}$.

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