Discrete High-Frequency p-Modes

Details Discrete High-Frequency p-Modes Discrete High-Frequency p-Modes

Jan 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...456..399j&link_type=abstract

Astrophysical Journal v.456, p.399

Astronomy and Astrophysics

Astronomy

32

Sun: Activity, Sun: Magnetic Fields, Sun: Oscillations

Scientific paper

Observations report that the p-mode frequencies change with the solar activity cycle. Over the frequency range 0 to 8.5 mHz, shifts can be either positive or negative, appearing to exhibit a wavelike behavior with downturn occurring at ˜4.0 mHz and upturn at ˜5.5 mHz. A simple polytrope convection zone model overlaid with an isothermal chromospheric atmosphere threaded by a uniform horizontal magnetic field demonstrates frequency shifts that are qualitatively similar to those observed for both high and low frequencies, with shifts being a consequence of simultaneous increases in chromospheric field strength and temperature.

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