Soft X-ray irradiance study
using Hinode/XRT synoptic composite images

Aki Takeda (Montana State University, USA) & Hinode/XRT team
27 October 2021 @ Hinode-14/IRIS-11 Joint Science Meeting

   Sample pages from the XRT Synoptic Composite Image Archive (SCIA)
  (http://solar.physics.montana.edu/HINODE/XRT/SCIA/)


1. Introduction




2. Method of Analysis



3. Calibration challenges and difficulties

Irradiance study assumes uniform quality of data throughout the mission, but the instruments are aging:

4. Results

4.1 Mission-long XRT irradiance (5-60A), filter-ratio Te and EM

4.2 Comparison with GOES/XRS


4.3 Comparison with Yohkoh/SXT


4.4 Comparison with SDO/HMI

HMI vs. XRT irrad 5 - 60 Å plot from Pevtsov et al. (2003)


4.5 Use of spatial information



5. Summary