Initial Results from Fitting Resolved Modes using HMI Intensity Observations (1707.09895v1)

Abstract: The HMI project recently started processing the continuum intensity images following global helioseismology procedures similar to those used to process the velocity images. The spatial decomposition of these images has produced time series of spherical harmonic coefficients for degrees up to $\ell=300$, using a different apodization than the one used for velocity observations. The first 360 days of observations were processed and made available. In this paper I present initial results from fitting these time series using my state of the art fitting methodology and compare the derived mode characteristics to those estimated using co-eval velocity observations.