Reduced Models of Magnetohydrodynamic Turbulence in the Interstellar Medium and the Solar Wind

摘要: Recent developments in the derivation of reduced models for weakly compressible magnetohydrodynamic (MHD) turbulence are discussed. A four-field system equations has been derived from to describe interstellar medium and solar wind. These apply a plasma permeated by spatially varying mean magnetic field when beta is order unity or less. In presence spatial inhomogeneities, predict pressure fluctuations Mach number turbulence, as observed Helios 1 2. uniform background homogeneous plasma, reduces so-called nearly incompressible system. weak-turbulence limit, dominated three-wave interactions, anisotropic energy spectrum deduced combination exact analytical results numerical simulations.