AIA 131/304/335 brightness not constant

[helioshk]

Since April 1st I noticed fluctuations in AIA 304 brightness, which manifests as flickering as seen in this video:

JHV_2022-04-05_12.40.41.mp4

Edit: AIA 131 and 335 are also affected

[bogdanni]

In JHV preferences there is a setting “Normalize SDO/AIA brightness” or something like that (I don’t have access to a computer). JHV tries to apply degradation correction after the fact. Since April 1st the correction should be done server-side before creating the images. Try turning that setting off and restart JHV.

In my limited testing few days ago, there is flickering indeed. It may be that the images are scaled for individual viewing like on a website, but not scaled for a fixed range to be viewed as a movie.

[helioshk]

I've disabled the option in JHV, the image is now slightly darker but it is still flickering.

It also happens on www.helioviewer.org which does not seem to have an option.
https://helioviewer.org/?movieId=5gQN5

[helioshk]

Looks like JHV does the normalization only once and not for each frame individually?

[bogdanni]

No, if enabled, the correction is done for each frame. Unfortunately, the current images seem to have individual brightness scaling therefore they flicker in movies. It’s obvious also in the website movies.

[dgarciabriseno]

It seems like this is actually a problem on LMSAL's side... I am wondering if it has to do with the change they just implemented to fix the AIA 1600 images.

Here's a video of me scrolling through some select jp2 images, the flickering is in the source files we get from lmsal.

Screen.Recording.2022-04-06.at.11.23.35.AM.mov

[dgarciabriseno]

We've raised this issue to LMSAL.

[dgarciabriseno]

It looks like the flickering has cleared up a lot around 4/18.

[helioshk]

I still see some flickering occasionally

JHV_2022-04-20_20.19.40.mp4

Is this an artifact from attempting to compensate exposure time?

[dgarciabriseno]

Trying to follow up on this with LMSAL.

[helioshk]

Any update from LMSAL?

[dgarciabriseno]

Not yet, just followed up again. Today, they asked for a recent video so I sent them one I just created that's still flickering.
https://helioviewer.org/?movieId=jM0N5

[dgarciabriseno]

This is still WIP on LMSAL's side.

[helioshk]

Is there anything else that can be done? It's a bit of a pity, I see videos with flickering images every day in my twitter feed.

[dgarciabriseno]

I plan to bring this up to them again once they resolve the SDO issues.
I've been running into it too. The thing was they never prioritized it and then the person I was in contact with that was supposed to be fixing it retired.

[dgarciabriseno]

Still waiting on Lockheed, last update was today saying they might be able to fix this next week.

[dgarciabriseno]

Restarting this conversation with lockheed.