Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...274..883l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 274, Nov. 15, 1983, p. 883-899.
Astronomy and Astrophysics
Astrophysics
44
Astronomical Photography, Chromosphere, H Alpha Line, Solar Atmosphere, Solar Flares, Astronomical Models, Coronal Loops, High Resolution, Solar Magnetic Field
Scientific paper
A geometrical technique is described for reconstructing the true shape of a solar loop observed on the disk. The method is based on the assumptions that (1) the loop's central axis lies in a plane, (2) its footpoints can be located, and (3) it is symmetrical in its own plane about an axis at right angles to the line joining the footpoints. The method is used to reconstruct three Hα (post-) flare loops in arcades visible in the declining stage of a large, two-ribbon flare. They are found to lie in planes nearly normal to the solar surface and to have heights in the range 44,500 - 50,000 km. The reconstructed central axis of each loop is compared with the magnetic field lines passing through the footpoints and apex for a point magnetic dipole and Pneuman's magnetic reconnection model of a two-ribbon flare.
Blows G.
Loughhead R. E.
Wang Jane-Ling
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