27 replies to this topic

[eblanken]

Hi Lance (aka PKDfan) & Ed (aka NeuvoApe) Astle,

 

I enjoyed reading your posts. I appreciate getting to know you both over time. I appreciate your humor and the perspective each of you bring here.

 

Best,

 

Ed

[Spectrum222]

Good day again!

 

Hey Ed, 

 

I did quite a bit of UV/VIS (and other wavelengths - NIR also!) spectroscopy in University many years ago, and also shortly afterwards with a federal lab after graduating (for about 2 years) - even got to check some of my skyglow filters through a few single and double-pass spectrophotometers - was fun checking the "specs" of various skyglow and O-III filters of the day.

 

About 20 years ago (!!! gosh I am getting a bit ancient !!! lol), I worked for FLIR in Canada on their industrial IR camera line, and had a Level II thermography certificate, which covered a lot on emissivity criteria of various surfaces for evaluations on non-contact temperatures. Very interesting physics, to be sure!

 

An interesting activity I have been doing recently to correlate these colorations with what I am seeing visually, is to run a "stacked" movie on Helioviewer, using the SDO HMI channel at 95-96%, the SDO AIA 1700A channel same, and then the SDO AIA 335A channel at around 60%. 

 

You can run the HMI/1700 with 335 toggled off over a day and pick a spot group of interest and run the movie generator. Shows evolution of the active region over time. I then toggle off the HMI channel and turn back on the 335 layer, and run same parameters (24 frame/sec, 1 day) and the resulting movie shows hot areas around the ARs in the frames selected. Spot groups that are very active show magnetic plasma exchanges which look like "static discharges" and are actually heat transfer processes in the active regions due to magnetic flux variances. Very cool stuff!

 

Nice to see all the action on Sol lately. 

 

NuevoApe: I used to like Uzo until I overdid it a few decades back! lol... Still may get back into that - but not today. 

 

Enjoy your skies. 

 

Darren

[ch-viladrich]

The image is a stack of 1000 frames of 4K video. It was taken with a 90mm maksutov and a Sony a6100 with a white light filter. Is the yellowish tint "real" or is the color messed up?

 

Nice observation !

 

The color looks good to me (even if using 4K video is probably not be best way to be sure of colors). In any case, I've got similar results :

 

https://www.cloudyni...the-mewlon-250/

 

More visual observations would certainly be welcome !