Helioseismology and the Solar Cycle

Details Helioseismology and the Solar Cycle Helioseismology and the Solar Cycle

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997sspn.work.....h&link_type=abstract

Technical Report, Sac Peak Workshop: Synoptic Solar Physics National Solar Observatory

Biology

Solar Cycles, Helioseismology, Observation, Oscillations, Sun, Activity Cycles (Biology), Frequency Shift, Line Spectra, Magnetic Flux, Solar Activity, Solar Cosmic Rays, Solar Flares, Solar Physics, Solar Prominences, Wave Reflection

Scientific paper

As with many other solar phenomena, the oscillations of the sun vary as the activity cycle progresses. It has been known since 1984 that the frequencies of the global modes in the 3-mHz band increase by about 0.5 micro Hz between minimum and maximum solar activity, and that the frequency shift is highly correlated with the surface magnetic field strength. We now have evidence that the lifetime of the modes, the acoustic reflectivity of the solar atmosphere, and the detailed shape of the oscillation spectral lines also vary with the activity cycle. In addition, helioseismic inversions show signs of cycle variations in the dynamics and structure of the solar interior, and in the characteristics of the source of the oscillations. In this paper, the observations of helioseismic solar cycle effects are reviewed, and the results placed in the context of synoptic solar physics.

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