Implications of solar p-mode frequency shifts

Details Implications of solar p-mode frequency shifts Implications of solar p-mode frequency shifts

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...370..752g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 370, April 1, 1991, p. 752-762.

Astronomy and Astrophysics

Astrophysics

120

Frequency Shift, Magnetohydrodynamics, Solar Magnetic Field, Solar Oscillations, Brightness Distribution, Chromosphere, Entropy, Frequency Distribution, Magnetic Disturbances

Scientific paper

An expression is derived that relates solar p-mode frequency shifts to changes in the entropy and magnetic field of the sun. The frequency variations result from changes in path length and propagation speed. Path length changes dominate for entropy perturbations, and propagation speed changes dominate for most types of magnetic field peturbations. The p-mode frequencies increased along with solar activity between 1986 and 1989; these frequency shifts exhibited a rapid rise with increasing frequency followed by a precipitous drop. The positive component of the shifts can be accounted for by variations of the mean square magnetic field strength in the vicinity of the photosphere. The magnetic stress perturbation decays above the top of the convection zone on a length scale comparable to the pressure scale height and grows gradually with depth below. The presence of a resonance in the chromospheric cavity means that the transition layer maintains enough coherence to partially reflect acoustic waves even near cycle maximum.

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