Effects of Background Periodic Flow on MHD Fast-wave Propagation to a Coronal Loop

Author:
Open Access
Publisher website
Google Scholar
Abstract
This paper investigates the propagation of MHD fast waves into a cylindrical coronal loop through an inhomogeneous stationary flow region. The background flow is assumed to have a small, spatially periodic structure in addition to a constant speed. This study focuses on the absorption of the wave energy in Alfvén resonance, comparing it with the constant flow case. A new flow (absorption) regime is induced by the periodic flow structure, which enhances the absorption for the antiparallel flow and inverse absorption (overreflection) for the parallel flow with respect to the axial wavevector, depending on the transitional layer and flow profiles. A giant overreflection and anomalous absorption behavior arises for some flow configurations. In the other flow regimes, its effect on the absorption is shown to be weak.
All Related Versions
Funding Information
  • National Research Foundation of Korea (2020R1I1A1A01066610)
  • National Research Foundation of Korea (2021R1I1A1A01045132)

This publication has 35 references indexed in Scilit: