Hydrodynamical Simulations of Slow Coronal Wind, Coronal Inflows and Polar Plumes

Details Hydrodynamical Simulations of Slow Coronal Wind, Coronal Inflows and Polar Plumes Hydrodynamical Simulations of Slow Coronal Wind, Coronal Inflows and Polar Plumes

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sf2a.conf..565p&link_type=abstract

"SF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: C. Charbonnel, F. Combes

Astronomy and Astrophysics

Astrophysics

Scientific paper

We use a hydrodynamical time-dependent coronal flux tube model extending from ˜ 1 R_&sun;, where nonreflecting boundary conditions are applied, to 30 R_&sun;, which includes a transition region sustained by the equilibrium between thermal conduction, radiative losses and a prescribed mechanical heating flux. We recover the observed inverse relationship between asymptotic wind speed and expansion factor if the coronal heating rate is a function of the local magnetic field strength. We show that inflows can be generated by suddenly increasing the rate of flux-tube expansion, and suggest that this process may be involved in the closing-down of flux at coronal hole boundaries. We also simulate the formation and decay of a polar plume, by including an additional, time-dependent heating source near the base of the flux tube.

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