Solar core rotation from low-degree BiSON* p-mode splittings: 1981-95

CHAPLIN, W. J., ELSWORTH, Y., ISAAK, G. R., MCLEOD, C. P., MILLER, B. A. and NEW, R. (1996). Solar core rotation from low-degree BiSON* p-mode splittings: 1981-95. Monthly notices of the Royal Astronomical Society, 283 (2), L31-L35.

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Abstract

In this paper, we present an analysis of the rotational splittings of low-degree solar p modes, as measured in full-disc helioseismological data collected by the Birmingham Solar-Oscillations Network (BiSON) between 1981 and 1995. These data provide coverage over solar activity cycles 21 and 22. Rotationally split multiplets were fitted in two 4-month and seven 8-month frequency spectra with a technique that minimizes a maximum-likelihood function consistent with chi(2) 2-d.o.f. statistics. The fitted modes used in the analysis map the range 1 less than or equal to l less than or equal to 3 and 2.0 less than or equal to v less than or equal to 3.1 mHz. The lower limit to the analysed frequency range was determined by the poorer quality of the pre-1990 data; the upper, very conservative, cut-off was imposed in order to avoid using data where the linewidths of the modes begin to increase substantially above 1 mu Hz.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Nanotechnology Centre for PVD Research
Depositing User: Ann Betterton
Date Deposited: 09 Jun 2010 16:11
Last Modified: 09 Jun 2010 16:11
URI: http://shura.shu.ac.uk/id/eprint/2042

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