COLLISIONLESS DAMPING AT ELECTRON SCALES IN SOLAR WIND TURBULENCE

TenBarge, J. M.; Howes, G. G.

doi:10.1088/0004-637X/774/2/139

Title: COLLISIONLESS DAMPING AT ELECTRON SCALES IN SOLAR WIND TURBULENCE

Journal Article · Tue Sep 10 00:00:00 EDT 2013 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/774/2/139· OSTI ID:22133859

TenBarge, J. M.; Howes, G. G. ^[1]

Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52242 (United States)

The dissipation of turbulence in the weakly collisional solar wind plasma is governed by unknown kinetic mechanisms. Two candidates have been suggested to play an important role in the dissipation, collisionless damping via wave-particle interactions and dissipation in small-scale current sheets. High resolution spacecraft measurements of the turbulent magnetic energy spectrum provide important constraints on the dissipation mechanism. The limitations of popular fluid and hybrid numerical schemes for simulation of the dissipation of solar wind turbulence are discussed, and instead a three-dimensional kinetic approach is recommended. We present a three-dimensional nonlinear gyrokinetic simulation of solar wind turbulence at electron scales that quantitatively reproduces the exponential form of the turbulent magnetic energy spectrum measured in the solar wind. A weakened cascade model that accounts for nonlocal interactions and collisionless Landau damping also quantitatively agrees with the observed exponential form. These results establish that a turbulent cascade of kinetic Alfven waves that is terminated by collisionless Landau damping is sufficient to explain the observed magnetic energy spectrum in the dissipation range of solar wind turbulence.

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OSTI ID:: 22133859

Journal Information:: Astrophysical Journal, Vol. 774, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X

Country of Publication:: United States

Language:: English

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Title: COLLISIONLESS DAMPING AT ELECTRON SCALES IN SOLAR WIND TURBULENCE

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