EIT images

[wafels]

No EIT images since August 2013. The EIT processing should be restarted.

[wafels]

A user has requested that the data should be regenerated.

[wafels]

An initial exploration of the code base shows that the EIT branch needs to be updated for the recent changes concerning the explicit inclusion of the source spacecraft and the harmonization of the hvs structure.

[wafels]

I have updated the EIT branch to use the current JP2Gen code (gen branch) (still to push the changes up to master). I have been able to produce images. However, it seems there is an issue when trying to rotate the image so north is up. The IDL internal routine POLY_2D fails with the error "Value of coefficient is out of allowed range". Not sure yet which coefficient is out of its allowed range. This seems to me to be a new error - I don't remember this one.

[wafels]

The POLY_2D error arises from a NaN being computed in the rot.pro function. The function has a line that calculates a value theta - for certain values of the roll angle this line appears to generate NaNs. However, on the command line the same calculation works just fine. The fix is to simply re-write this line; now, a NaN is no longer generated. This does not really get to the bottom of what is causing the NaN however. To test this, I ran the code to create images of all the EIT image science data taken in 2023. The rest of the pipeline works - images are written and now appear on helioviewer.org. A few more steps are needed.

• Create and upload all EIT images from 2013/08/07 to 2023/01/23
• Write a script to regularly and frequently look for new EIT data and process those data
• Check that the script is actually working
• Finalize the fix and commit it.

[wafels]

The code is now being run on another platform - perhaps the NaN will go away??? Worth a shot, but does not explain the NaN, but the NaN is probably not a helioviewer issue.