[X] My Assistant

[mcaplinger]

First group of images, including Ganymede, now on missionjuno. More to follow.

[Bjorn Jonsson]

Thanks. A crude way to estimate the radiation dose might be to count spikes/bright pixels in the images.

I'm still wondering about scattered light. I suspect it might be possible in theory to construct a 3D model of JunoCam and the spacecraft components that directly or indirectly can scatter light into the camera and then use some sort of ray tracing to construct an accurate model of scattered light, including its color, for each image. I imagine this would be extremely complicated and a lot of work to do and the practical value limited since it is usually rather trivial to determine the approximate correction per perijove required to process the raw images into approximately true color.

Not necessarily a good metric, but an easy one to produce...

Here are color ratios from the per-perijove Radiation Trend Monitoring datatakes.
The ratios are of the 20th, 200th, and 2000th brightest decompanded (but otherwise unmodified) value
from each color channel.

Did you take into account that parts of these images are usually overexposed/saturated?

I ended up multiplying the red values by 1.0, green values by 1.27 and blue values by 3.05 to correct the color of the PJ35 images. This is a part of image PJ35_57 in approximately true color/contrast and enhanced versions:

[mcaplinger]

A crude way to estimate the radiation dose might be to count spikes/bright pixels in the images.

Unfortunately it's hard to correlate radiation effects in the sensor like this ("displacement damage dose") to overall radiation dose that damages glass ("total ionizing dose".)

We see a slow increase in warm pixels but it's been very gradual (also hard to control for orbit-to-orbit temperature variations.)