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

By Y. Elsworth, R. Howe, G. R. Isaak, C. P. McLeod, B. A. Miller, R. New, C. C. Speake and S. J. Wheeler


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

Year: 1994
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