Rotational Signature and Possible r-Mode Signature in the GALLEX Solar Neutrino Data

Recent analysis of the Homestake data has yielded evidence that the solar neutrino flux varies in time—more specifically, that it exhibits a periodic variation that may be attributed to rotational modulation occurring deep in the solar interior, either in the tachocline or in the radiative zone. Here we present a spectral analysis of the GALLEX data that yields supporting evidence for this rotational modulation. The most prominent peak in the power spectrum occurs at the synodic frequency of 13.08 yr (cycles per year) and is estimated to be significant 21

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