Flows in coronal loops driven by Alfvén waves: 1.5 MHD simulations with transparent boundary conditions

Details Flows in coronal loops driven by Alfvén waves: 1.5 MHD simulations with transparent boundary conditions Flows in coronal loops driven by Alfvén waves: 1.5 MHD simulations with transparent boundary conditions

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..679..750g&link_type=abstract

SOLAR WIND TEN: Proceedings of the Tenth International Solar Wind Conference. AIP Conference Proceedings, Volume 679, pp. 750-7

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4

Particle Emission, Solar Wind, Solar Wind Plasma, Sources Of Solar Wind

Scientific paper

We investigate time-dependent siphon flows in coronal loops driven by Alfvén waves. We consider a 1.5 D isothermal, MHD model in which the coordinate is the abscissa along the loop, with an external gravity field reversing sign in the middle, and a uniform magnetic field parallel to the x-axis. We use transparent boundary conditions, meant to describe the upper part of the loop. The reaction of the loop to Alfvén waves depends entirely on whether we allow or not incoming parallel velocity fluctuations: only in the latter case do transonic flows arise, but the flow is in that case generated by a nonlinear coupling of the waves with the boundaries.

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