Anomalous variations in low-degree helioseismic mode frequencies

HOWE, R., CHAPLIN, W. J., ELSWORTH, Y., HILL, F., KOMM, R. W., ISAAK, G. R. and NEW, R. (2006). Anomalous variations in low-degree helioseismic mode frequencies. Monthly Notices of the Royal Astronomical Society, 369 (2), 933-938.

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Link to published version:: 10.1111/j.1365-2966.2006.10346.x

Abstract

We compare changes in the frequencies of solar acoustic modes with degree between 0 and 2, as derived from Global Oscillation Network Group (GONG), Birmingham Solar Oscillations Network (BiSON) and Michelson Doppler Imager (MDI) spectra obtained between 1995 and 2003. We find that, after the solar-activity dependence has been removed from the frequencies, there remain variations that appear to be significant, and are often well correlated between the different data sets. We consider possible explanations for these fluctuations, and conclude that they are likely to be related to the stochastic excitation of the modes. The existence of such fluctuations has possible relevance to the analysis of other low-degree acoustic mode spectra such as those from solar-type stars.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Nanotechnology Centre for PVD Research
Identification Number: 10.1111/j.1365-2966.2006.10346.x
Depositing User: Ann Betterton
Date Deposited: 17 May 2010 17:25
Last Modified: 17 May 2010 17:25
URI: http://shura.shu.ac.uk/id/eprint/2075

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