Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009a%26a...497..537p&link_type=abstract
Astronomy and Astrophysics, Volume 497, Issue 2, 2009, pp.537-543
Astronomy and Astrophysics
Astrophysics
10
Interplanetary Medium, Solar Wind, Sun: Corona, Sun:, Magnetic Fields
Scientific paper
Aims: We explore the effects of varying the areal expansion rate and coronal heating function on the solar wind flow. Methods: We use a one-dimensional, time-dependent hydrodynamical code. The computational domain extends from near the photosphere, where nonreflecting boundary conditions are applied, to 30 R_&sun;, and includes a transition region where heat conduction and radiative losses dominate. Results: We confirm that the observed inverse relationship between asymptotic wind speed and expansion factor is obtained 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.
Grappin Roland
Leorat Jacques
Pinto Raquel
Wang Yu-Ming
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