AUTHOR=Korzennik Sylvain G. 

TITLE=Precision and systematic errors in global helioseismology mode fitting and inversions: Leveraging some 25 years of nearly uninterrupted observations

JOURNAL=Frontiers in Astronomy and Space Sciences

VOLUME=Volume 9 - 2022

YEAR=2023

URL=https://www.frontiersin.org/journals/astronomy-and-space-sciences/articles/10.3389/fspas.2022.1031313

DOI=10.3389/fspas.2022.1031313

ISSN=2296-987X

ABSTRACT=We have on hand some 25 years of nearly uninterrupted high-quality and
high-cadence global helioseismic data: GONG has been producing science
quality data since 1995, MDI started in 1996 and HMI took over in
2010. Fundamental new constraints have been imposed by helioseismic
inferences, yet global helioseismology data processing seems somewhat
frozen in time for some of its methodologies.

I review and discuss some specific aspects of global helioseismology
data analysis, with an emphasis on the issues and challenges presented
by mode fitting and inversion techniques. I compare and contrast
results derived by different fitting methods, whether using different
techniques, different lengths of time series or different fitting
parameters, like leakage matrices or the inclusion or omission of the mode
profile asymmetry, leading to our current best handle on the residual
systematic errors.