Effects of Weak-to-Moderate Vertical Magnetic Fields on Solar f- and p-Modes

Details Effects of Weak-to-Moderate Vertical Magnetic Fields on Solar f- and p-Modes Effects of Weak-to-Moderate Vertical Magnetic Fields on Solar f- and p-Modes

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...451..372c&link_type=abstract

Astrophysical Journal v.451, p.372

Astronomy and Astrophysics

Astronomy

25

Magnetohydrodynamics: Mhd, Sun: Faculae, Plages, Sun: Magnetic Fields, Sun: Oscillations

Scientific paper

Observations indicate that solar p-modes encountering regions of enhanced magnetic field such as active region plage are partially absorbed. We adopt a simple vertical field model and investigate the possibility that the responsible mechanism is slow mode leakage, which has been at least partially successful in explaining absorption by sunspots. It is found that there are two frequency ranges with very different behavior: (1) below the chromospheric acoustic cutoff frequency, and (2) above it. In the first case, which includes the 5 minute band, the f- and p1-modes would be expected to suffer substantial absorption, but p-modes of higher radial order would not be damped sufficiently to account for observations. On the other hand, in the higher frequency range (≥ 5 mHz), damping lengths of f- and P1-P3 modes are smaller than or comparable to typical plage sizes, indicating that substantial absorption should occur.

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