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Compensated-current instability of kinetic Alfvén waves

De Keyser, J.; Malovichko, P.; Voitenko, Y.

We study a non-resonant instability of kinetic Alfvén waves (KAWs) driven by compensated currents. Such currents set up in response to energetic ion beams occurring in many space and astrophysical plasmas, like foreshock regions in the solar wind and around supernova remnants. Kinetic effects of the background ion gyroradius make the KAW instabili…

Anisotropy of Alfvénic turbulence in the solar wind and numerical simulations

Horbury, T. S.; Chen, C. H. K.; Mallet, A. +2 more

We investigate the anisotropy of Alfvénic turbulence in the inertial range of slow solar wind and in both driven and decaying reduced magnetohydrodynamic simulations. A direct comparison is made by measuring the anisotropic second-order structure functions in both data sets. In the solar wind, the perpendicular spectral index of the magnetic field…