Visibility IV / V
Now all to describe the proton arc. Here you can see from the zenith south across the sky.
EDIT. I added pictures. That proton arc was so dim that it was not visible to the naked eye at all. I guess I could first notice it from the Sirius sky camera in Jyväskylä and by photographing it came to the fore. Stripes were also visible, (Figures 3 and 4) they were dim now too. The bright satellite came in three images that stacked together in Halostack (Figure 2), I suddenly didn’t find that in Iridium, at least.