Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...337..287e&link_type=abstract
Astronomy and Astrophysics, v.337, p.287-293 (1998)
Astronomy and Astrophysics
Astrophysics
36
Line: Profiles, Waves, Sun: Chromospheres, Sun: Corona, Sun: Transition Region
Scientific paper
Line widths derived from observational data obtained by SUMER onboard SOHO in August 1996 at disk center and at the limb are used to confront those derived via assuming Alfven and/or magneto-acoustic wave heating. The observational data clearly shows a center-to-limb variation in the upper chromospheric and transition region lines, with only a marginal difference in the coronal lines in the sense of additional broadening further from disk center. Numerical estimations based on linear MHD, favour the existence of Alfven wave heating over magneto-acoustic heating, although further calculations are required. For example, non-linear effects could change the wave characteristics which in turn can have a major effect on the overall line broadening.
Doyle Gerry J.
Erdelyi Robert
Pérez M. E.
Wilhelm Klaus
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