Pseudo-global Fitting of Gapped Helioseismic Data - Astrophysics > Solar and Stellar AstrophysicsReport as inadecuate




Pseudo-global Fitting of Gapped Helioseismic Data - Astrophysics > Solar and Stellar Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: Mode fitting or -peak-bagging- is an important procedure in helioseismologyallowing one to determine the various mode parameters of solar oscillations. Wehave recently developed a new -pseudo-global- fitting algorithm as a way ofreducing the systematic bias in the fits of certain mode parameters that areseen when using -local- fitting techniques to analyse -sun-as-a-star- p-modedata. This new algorithm has been designed specifically to gain the advantagesof fitting the entire power spectrum, while retaining the efficiency of localfitting techniques.Using simulated data with a full fill we have previously shown that thepseudo-global routine reduces the bias in estimates of the frequencies andasymmetries and in the estimates of the solar background when compared with atraditional fitting technique. Here we present results that show that thepseudo-global routine is also effective in reducing bias in the parameterestimates when the time-series has significant gaps. As such we are now able toemploy the routine in order to fit ground based helioseismic data such as thatcollected by the Birmingham Solar Oscillations Network BiSON.



Author: S. T. Fletcher, W. J. Chaplin, Y. Elsworth, R. New

Source: https://arxiv.org/



DOWNLOAD PDF




Related documents