Computer Science – Numerical Analysis
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.286..311r&link_type=abstract
In ESA, Seismology of the Sun and Sun-Like Stars p 311-314 (SEE N89-25819 19-92)
Computer Science
Numerical Analysis
3
Chromosphere, P Waves, Solar Magnetic Field, Solar Oscillations, Data Acquisition, Helioseismology, Magnetic Effects, Numerical Analysis
Scientific paper
The influence of a magnetic chromosphere on p- and f-modes of oscillation is explored theoretically, modelling the chromosphere by an isothermal atmosphere permeated by a horizontal magnetic field and the field-free convection zone by a polytrope. It is pointed out that active regions, characterized by magnetic field strengths of the order of 100 gauss, have a significant effect on the frequencies of high degree modes. The frequency of the f-mode is increased by the presence of a magnetic field; the frequencies of p-modes are decreased. In an evolving active region the frequencies of high degree p- and f-modes are systematically split apart by the changing magnetic field. These effects should be apparent in a comparison of high resolution data sets for active regions with either low resolution sets or high resolution sets for quiet regions.
Campbell Robert W.
Roberts Barney B.
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