Solar p-mode frequencies and their dependence on solar activity recent results from the BISON network

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Acoustic Frequencies, P Waves, Solar Activity, Solar Cycles, Solar Interior, Solar Oscillations, Error Analysis, Fourier Transformation, Solar Spectrometers

Scientific paper

We present here high-accuracy determinations of the frequencies of low-l solar p-modes and their solar-cycle dependence. The data were obtained using the Birmingham network of solar spectrometers (BISON). The precision of the measurements is discussed. Our previously published results of a significant frequency shift between solar minimum and solar maximum, apparently independent of l and similar to that found by other workers for intermediate-l modes, is confirmed and extended. This suggests that at most only a small fraction of the variation is due to the solar core. Sets of frequencies at high and low solar activity, and an average corrected for solar-activity effects, are presented. There is now evidence that the solar-activity dependence of the frequencies varies across the 5 minute spectrum.

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