SDO-AIA Response Functions: Insights and Updates from Hinode EIS Bright Point Data
Abstract
The Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory is a state-of-the-art imager with the potential to do unprecedented time-dependent multithermal analysis at every pixel on scales short compared to the radiative and conductive cooling times. Recent results, however, have identified shortcomings in the CHIANTI atomic physics data base, which is used to construct the instrument response functions. We have done Differential Emission Measure analysis using simultaneous AIA and Hinode EIS observations of six X-ray bright points. Our results not only support the conclusion that CHIANTI is incomplete near 131 A, but more importantly, suggest that the peak temperature of the Fe VIII ionization fraction is likely to be closer to Log T = 5.8 than to the current value of Log T = 5.7. Using a revised ionization balance calculation for Fe VIII, we find that the observed AIA 131-A flux can be underestimated by 1.25, which is smaller than previous comparisons. Making these adjustments brings not only the AIA 131-A data but also the EIS Fe VIII lines into better agreement with the remainder of the bright point data. In addition, we find that CHIANTI is reasonably complete in the AIA 171- and 193-A bands.
- Publication:
-
American Astronomical Society Meeting Abstracts #220
- Pub Date:
- May 2012
- Bibcode:
- 2012AAS...22030902S