Cross helicity sign reversals in the dissipative scales of magnetohydrodynamic turbulence

V. Titov¹ - R. Stepanov¹ - N. Yokoi² - M. Verma³ - R. Samtaney⁴

¹ Institute of Continuous Media Mechanics, Perm 614013, Russia
² Institute of Industrial Science University of Tokyo, Tokyo 153-8505, Japan
³ Department of Physics, Indian Institute of Technology Kanpur, Kanpur 20816, India
⁴ Mechanical Engineering, Division of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia

Abstract
Direct numerical simulations of magnetohydrodynamic turbulence with kinetic energy and cross helicity injections at large scales are performed. It was observed that cross helicity changes its sign as we go from large and intermediate scales to small scales. In addition, the magnetic reconnections are strongest in the regions, where the cross helicity changes the sign and becomes smallest in magnitude. Thus, our simulations provide an important opportunity to explore the regions of magnetic reconnections in nonlinear MHD. Figs 4, Refs 18.