Power spectrum analysis of LMSU (Lomonosov Moscow State University) nuclear decay-rate data: Further indication of r-mode oscillations in an inner solar tachocline

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• 作者：P.A. Sturrock^a ; ^{sturrock@stanford.edu} ; A.G. Parkhomov^b ; ^{alexparh@mail.ru} ; E. Fischbach^c ; ^{Ephraim@physics.purdue.edu} ; J.H. Jenkins^c ; ^d ; ^{jere@purdue.edu}
• 关键词：Sun ; Neutrinos
• 刊名：Astroparticle Physics
• 出版年：2012
• 期刊代码：4_09276505
• 类别：ph
• 出版时间：June, 2012
• 卷：35
• 期：11
• 页码：755-758
• 文件大小：393 K

摘要

This article presents a power-spectrum analysis of 2350 measurements of the decay process acquired over the interval August 4 2002 to February 6 2009 at the Lomonosov Moscow State University. 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 to 3.98 year^鈭?, which are very similar to an array of peaks in a power spectrum formed from Mt Wilson 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^鈭?. 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.