Low-degree, l=4 modes in full-disc BiSON helioseismological data

CHAPLIN, W. J., ELSWORTH, Y., HOWE, R., ISAAK, G. R., MCLEOD, C. P., MILLER, B. A. and NEW, R. (1996). Low-degree, l=4 modes in full-disc BiSON helioseismological data. Monthly notices of the Royal Astronomical Society, 280 (4), 1162-1166.

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We demonstrate that some l=4 acoustic eigenmodes of the Sun are clearly distinguishable in long power spectra generated from Doppler velocity residuals collected in unimaged sunlight by the six-station Birmingham Solar Oscillations Network (BiSON). Modes covering the range n=17 to 21 have been measured in 16-month-long power spectra. They have typical amplitudes - when measured in full-disc Doppler velocity data - of less than similar to 1 cm s(-1) per root bin, and their frequencies have been determined to fractional accuracies of the order of 3 parts in 10(5). The sensitivity of the whole-disc observations to these modes - as implied by the data - appears to be approximately a factor of 2 greater than the theoretical predictions of Christensen-Dalsgaard.

Item Type: Article
Research Institute, Centre or Group - Does NOT include content added after October 2018: Materials and Engineering Research Institute > Advanced Coatings and Composites Research Centre > Nanotechnology Centre for PVD Research
Page Range: 1162-1166
Depositing User: Ann Betterton
Date Deposited: 09 Jun 2010 16:12
Last Modified: 19 Mar 2021 01:00
URI: https://shura.shu.ac.uk/id/eprint/2031

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