Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sf2a.conf..567p&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 investigate the effects of the injection of alfvén waves into the solar corona using an axi-symmetric 2.5 MHD numerical model extending from the top of the transition region up to about 15 solar radii. Transparent boundary conditions are applied at the top and bottom of the numerical domain and waves are injected by perturbing the alfvénic characteristic at the bottom boundary. We study two kinds of magnetic configuration: a) a quadrupolar region inside an equatorial streamer and b) a small bipole within an unipolar flux polar coronal hole region. In configuration a), waves generate a pattern of convective flows (10-50 km/s) inside the streamer and simultaneously slow reconnection around the magnetic null point, which continuously rises upwards (≈ 25 km/s). In configuration b), we observe an increase in density, wind speed and mass flux along its central axis in a behaviour which resembles that of polar plumes in coronal holes. Current density accumulates around the magnetic null point.
Grappin Roland
Leorat Jacques
Pinto Raquel
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