Detailed Image Comparison using MDI, HMI and GONG Co-Eval Observations
Abstract
I present preliminary results from detailed image comparison using MDI, HMI and GONG co-eval observations taken in 2014, when all three instruments were operational. This comparison allows me to estimate both the instrumental image distortion and the instrument PSF, with respect to HMI. Both intensity and velocity images are compared when available. The precise observing perspective of each instrument had to be accounted since it affects the projected image on the instrument detector at the required level of precision (i.e., a fraction of an HMI pixel). In the process, it was discovered that the meta data generated by the respective projects were not accurate enough. While the inclusion of the image distortion and the instrument PSF in the spatial decomposition will improve the determination of high degree modes, it may also benefit other local helioseismic analysis.
- Publication:
-
AAS/Solar Physics Division Abstracts #48
- Pub Date:
- August 2017
- Bibcode:
- 2017SPD....4811302K