Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...371..387e&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 371, April 10, 1991, p. 387-395. University of Saint Andrews-supported rese
Astronomy and Astrophysics
Astrophysics
24
Chromosphere, Magnetohydrodynamic Waves, Solar Cycles, Solar Magnetic Field, Solar Oscillations, Asymptotic Methods, Magnetohydrostatics, Photosphere, Solar Atmosphere
Scientific paper
Previous investigations of the effect of a magnetic canopy on the solar p- and f-modes are extended to allow for variations in height of the magnetic canopy. Analytical solutions in the limit of long horizontal wavelength are obtained; the solutions exhibit explicitly the dependence of frequency shifts on magnetic field strength, wavenumber, and canopy height. Frequency shifts are principally due to changes in canopy height. Full numerical solutions are also presented. It is argued that changes in chromospheric magnetism will be manifest in p- and f-mode data sets gathered at different phases of the solar cycle. A comparison of theoretical results obtained here with the recent data obtained by Libbrecht and Woodard (1990) is made.
Evans David J.
Roberts Barney B.
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