title: Multiscale Nature of the Dissipation Range in Gyrokinetic Simulations of Alfvénic Turbulence.
abstract: Nonlinear energy transfer and dissipation in Alfvén wave turbulence are analyzed in the first gyrokinetic simulation spanning all scales from the tail of the MHD range to the electron gyroradius scale. For typical solar wind parameters at 1 AU, about 30% of the nonlinear energy transfer close to the electron gyroradius scale is mediated by modes in the tail of the MHD cascade. Collisional dissipation occurs across the entire kinetic range k(⊥)ρ(I)≳1. Both mechanisms thus act on multiple coupled scales, which have to be retained for a comprehensive picture of the dissipation range in Alfvénic turbulence.
authors.affiliation: Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA and Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, 85748 Garching, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Told
authors.affiliation: Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA and Max-Planck-Institut für Plasmaphysik, Boltzmannstraße 2, 85748 Garching, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Jenko
authors.affiliation: IREAP, University of Maryland, College Park, Maryland 20742, USA.
authors.forename: J M
authors.initials: JM
authors.lastname: TenBarge
authors.affiliation: Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa 52242, USA.
authors.forename: G G
authors.initials: GG
authors.lastname: Howes
authors.affiliation: Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
authors.forename: G W
authors.initials: GW
authors.lastname: Hammett