Computer Science
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.464...91h&link_type=abstract
In: Proceedings of the SOHO 10/GONG 2000 Workshop: Helio- and asteroseismology at the dawn of the millennium, 2-6 October 2000,
Computer Science
8
Sun, Magnetic Flux Distribution, Numerical Methods
Scientific paper
The GONG PEAKFIND algorithm generates a frequency for each m in an l,n multiplet. For most purposes, we then fit orthogonal polynomials to the frequencies to derive α-coefficients. The even-order coefficients are strongly correlated with the distribution of the magnetic flux. With over 4 years of GONG data, we can now demonstrate that the frequencies of individual n, l, m components experience shifts correlated with the surface flux distribution in the region sampled by that mode. At high activity levels, this can give rise to visible distortion of the "S-curve" shape within a multiplet, which in turn means that higher-order α coefficients are needed to correctly represent the shape and estimate the central frequency of the multiplet.
Hill F. F.
Howe Rachel
Komm Rudolf W.
Landy David H.
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