Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...241..604a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 241, no. 2, Jan. 1991, p. 604-612.
Astronomy and Astrophysics
Astrophysics
26
Solar Corona, Solar Magnetic Field, Solar Prominences, Boundary Value Problems, Force-Free Magnetic Fields, Magnetic Field Configurations, Photosphere, Stellar Models
Scientific paper
The possibility of prominence formation in sheared coronal arcades is investigated. The creation of a dip at the summit of field lines is a likely requirement before a prominence can form; then dense plasma can be supported against gravity by the Lorentz force. It is proved that, in fact, no shear profile can create a dip in a two-dimensional force-free arcade if the photospheric field is bipolar. However, numerical investigations show that shearing an arcade can induce very flat field lines. It is investigated, in order of magnitude, how this flattening of the field can increase the free fall time of a dense plasma. Also, the interaction between shear and twist is analyzed; the critical twist needed to have a dip is a decreasing function of shear.
Amari Tahar
Browning Philippa
Démoulin Pascal
Hood Alan
Priest Eric
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