Comparing Leakage Matrices
Abstract
The standard leakage matrix for global mode helioseismology is calculated assuming a value of zero for the P-angle, B-angle, and CCD offsets, and value of 1 AU for the observer distance. Since image center is not constant we vary this parameter so see what effect is has on the leaks and explore the possibility of using a leakage matrix averaged over pixel offsets. Since the B-angle and observer distance vary in a known way with time, we recompute the leakage matrix for realistic values of these parameters and repeat the fits to find out how the mode parameters are affected. Since previous studies have indicated certain systematic errors are associated with the apodization, we also compute leakage matrices for different apodizations, repeat the spherical harmonic decomposition with those apodizations, and fit these to see the effect on mode parameters. Lastly, we compare the leakage matrix computed at Stanford with a completely independent calculation in order to both verify our results and discover the source of any discrepancy.
- Publication:
-
SDO-3: Solar Dynamics and Magnetism from the Interior to the Atmosphere
- Pub Date:
- October 2011
- Bibcode:
- 2011sdmi.confE..44L
- Keywords:
-
- SDO;
- SDO-3;
- SDO 3;
- SDO Workshop;
- LWS/SDO-3/SOHO-26/GONG-2011 Workshop;
- Solar Dynamic Observatory