Events

We have by now over two decades of nearly uninterrupted high quality and high cadence global helioseismogical 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 seems frozen in time in some of its methodologies and has, at times, claimed to have detected what ended up being spurious features. I will present a biased - i.e. partial and personal - review of  the current state of global helioseismology, with some emphasis on issues and challenges presented by mode fitting, inversion techniques and the hunt for the residual systematic errors.