Magnetohydrodynamic turbulent cascade of coronal loop magnetic fields

Rappazzo, A. F.; Velli, M.
Referencia bibliográfica

Physical Review E, vol. 83, Issue 6, id. 065401

Fecha de publicación:
6
2011
Número de autores
2
Número de autores del IAC
1
Número de citas
23
Número de citas referidas
23
Descripción
The Parker model for coronal heating is investigated through a high resolution simulation. An inertial range is resolved where fluctuating magnetic energy EM(k⊥)∝k⊥-2.7 exceeds kinetic energy EK(k⊥)∝k⊥-0.6. Increments scale as δbℓ≃ℓ-0.85andδuℓ≃ℓ+0.2 with velocity increasing at small scales, indicating that magnetic reconnection plays a prime role in this turbulent system. We show that spectral energy transport is akin to standard magnetohydrodynamic (MHD) turbulence even for a system of reconnecting current sheets sustained by the boundary. In this new MHD turbulent cascade, kinetic energy flows are negligible while cross-field flows are enhanced, and through a series of “reflections” between the two fields, cascade more than half of the total spectral energy flow.