Date post: | 13-Dec-2015 |
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• We take a look at the recent XRT 9-filter synoptic observations on Jan 5 (12 UT), Jan 9 (20 UT), and Jan 13 (20 UT). We then compare them with the corresponding AIA images.
• We illustrate our results using the data taken on Jan 5. Two movies with XRT and AIA observations at different filters and channels can be found at: http://hea-www.harvard.edu/trace/SSXG/ynsu/XRT-AIA/XRT-AIA.html
XRT observations
• Thin-Be and Al/poly+Ti/poly are two ideal filters for very dynamic active region observations.
• All three poly filter images look similar. If we need thinner filters for normal active regions, then C-poly and Ti-poly are good options, since spots are more visible in Al-poly images.
• Al-med and Be-med are two good options for the thicker-filter AR observations. Very few features can be identified in Thick-Al images.
XRT vs. AIA• 335 channel in AIA is the one that looks
closest to XRT images.• In all XRT filters, Al-mesh is the one looks
closest to 335 Å image. See Figure 1 in next slide. The AIA 335 Å image in this presentation is summed over 3 minutes.
• For some active regions, most XRT filters can see structures which are not visible in all AIA filters.
Figure 2
XRT Thin-Be AIA 335