Interpretation of solar-cycle variability in high-degree p-mode frequencies

Details Interpretation of solar-cycle variability in high-degree p-mode frequencies Interpretation of solar-cycle variability in high-degree p-mode frequencies

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992natur.355..230e&link_type=abstract

Nature (ISSN 0028-0836), vol. 355, Jan. 16, 1992, p. 230-232. Research supported by SERC.

Computer Science

Sound

32

Chromosphere, Solar Cycles, Solar Magnetic Field, Solar Oscillations, Sound Waves, Helioseismology, Magnetic Flux, Radiation Trapping, Spherical Harmonics

Scientific paper

Predictions of solar-cycle variability in high-degree p-mode frequencies from simple models of the 'magnetic canopy' which permeates the solar atmosphere and overlies all of the sun's surface are compared with the observations of Libbrecht and Woodard (1990). Good agreement is found with the observed frequency shifts for modes of frequency less than 4 mHz, through a mechanism in which an increasing magnetic field induces 'stiffening' of the sun's chromosphere. Above this frequency there is something missing in the mode; it is speculated that the behavior above 4 mHz is related to a cutoff frequency in the solar atmosphere above which waves are trapped only partially.

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