Monochrome and color processing.
- 300/1200 uncoated Newtonian
- ASI 174 MM
- 0,5 ms - 4000/400 frames
- Edmund Optics 394/10 nm 25 mm/ZWO Blue (ERF)
- poor seeing - zero wind - through 40% density cirrus clouds
Hi, thank you very much for your kind comment. The bright penumbral grain is new for me, I have to understand what it is exactly, thank you for the idea.Montana wrote: ↑Sun Sep 18, 2022 5:26 pm That's absolutely terrific I have caught one of these before and asked the Kanzelhohe team, they reckoned it was a bright penumbral grain viewtopic.php?t=35468
Like a mini flare.
It is very exciting to see and quite rare but much more common than a true WL flare.
Alexandra
Hi, thank you!DeepSolar64 wrote: ↑Sun Sep 18, 2022 7:04 pm Laszlo,
This is with a wide band CaK filter, right?
It looks like a small flare to me. The reason I asked about the filter is that flares should be considerably easier to see in CaK than in continuum. A flare has to be unusually intense to be seen in white light.
Great catch!
James
Is a penumbral grain the same as a flare kernel? I hear flare kernels are visible in narrowband Sodium filters. A flare kernel may be where the flare is rooted to the photosphere?