Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...354..749r&link_type=abstract
Astronomy and Astrophysics, v.354, p.749-759 (2000)
Astronomy and Astrophysics
Astrophysics
19
Magnetohydrodynamics (Mhd), Plasmas, Waves, Methods: Analytical, Methods: Numerical
Scientific paper
In plane-parallel flows velocity shear couples magnetohydrodynamic (MHD) wave modes and induces their mutual transformations. Since the majority of astrophysical flows are not plane-parallel it is important to clarify whether this nonmodal phenomenon also takes place in flows with a more complicated spatial geometry and kinematics. The recently devised local method for studying linear perturbation dynamics in flows with arbitrary kinematic complexity is tailor-made for this actual problem. In this paper we apply this new method to the study of velocity shear induced wave transformations in a cylindrical flux tube. We found that the MHD modes sustained by the flux tube flow--the Alfvén (AW), the slow magnetosonic (SMW), and the fast magnetosonic (FMW) waves -- are efficiently coupled through the agency of the velocity shear. Based on this issue we argue that the individual wave transformation events, happenning perpetually and irregularly in the whole space occupied by the flux tube flow, establish the regime of shear induced wave oscillations throughout the flow. We claim that this previously overlooked linear phenomenon may be important for the generation of solar hydromagnetic waves, for the transmission of the waves through the transition region, for coronal heating and for the acceleration of the solar wind.
Mahajan Swadesh M.
Poedts Stefaan
Rogava Andria D.
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