Anomalous k(perpendicular to)(-8/3) Spectrum in Electron Magnetohydrodynamic Turbulence

作者：Meyrand Romain^*; Galtier Sebastien

来源：Physical Review Letters, 2013, 111(26): 264501.

DOI：10.1103/PhysRevLett.111.264501

Electron magnetohydrodynamic turbulence is investigated under the presence of a relatively strong external magnetic field b(0)e(parallel to) and through three-dimensional direct numerical simulations. Our study reveals the emergence of a k(perpendicular to)(-8/3) scaling for the magnetic energy spectrum at scales k(parallel to)(D) <= k(perpendicular to) <= k(perpendicular to)(D), where k(parallel to)(D) and k(perpendicular to)(D) are, respectively, the typical largest dissipative scales along and transverse to the b(0) direction. Unlike standard magnetohydrodynamic, this turbulence regime is characterized by filaments of electric currents parallel to b(0). The anomalous scaling is in agreement with a heuristic model in which the transfer in the parallel direction is negligible. Implications for solar wind turbulence are discussed.

• 出版日期2013-12-26