Power Spectrum Analysis of LMSU (Lomonosov Moscow State University) Nuclear Decay-Rate Data: Further Indication of r-Mode Oscillations in an Inner Solar Tachocline

Abstract

This article presents a power-spectrum analysis of 2,350 measurements of the ${}^{90}$Sr/${}^{90}$Y decay process acquired over the interval 4 August 2002 to 6 February 2009 at the Lomonosov Moscow State University (LMSU). As we have found for other long sequences of decay measurements, the power spectrum is dominated by a very strong annual oscillation. However, we also find a set of low-frequency peaks, ranging from 0.26 year${}^{-1}$ to 3.98 year${}^{-1}$, which are very similar to an array of peaks in a power spectrum formed from Mt Wilson solar diameter measurements. The Mt Wilson measurements have been interpreted in terms of r-mode oscillations in a region where the sidereal rotation frequency is 12.08 year${}^{-1}$. We find that the LMSU measurements may also be attributed to the same type of r-mode oscillations in a solar region with the same sidereal rotation frequency. We propose that these oscillations occur in an inner tachocline that separates the radiative zone from a more slowly rotating solar core.

5 pages, 8 figures. v2 corrects three typographical errors on page 3, including the missing list of r-modes in sec. 3, para 2

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• Evidence for Correlations Between Nuclear Decay Rates and Earth-Sun Distance
• Magnetic Rossby waves in the solar tachocline and Rieger-type periodicities
• Power Spectrum Analyses of Nuclear Decay Rates
• Power Spectrum Analysis of BNL Decay-Rate Data
• Power Spectrum Analysis of Physikalisch-Technische Bundesanstalt Decay-Rate Data: Evidence for Solar Rotational Modulation
• Power Spectrum Analysis of Mount-Wilson Solar Diameter Measurements: Evidence for Solar Internal R-mode Oscillations
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• Influence of Relic Neutrinos on Beta Radioactivity

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