Is that why part of the sky here was pink a little bit after the sun had gone down?
That
could just be high altitude clouds doing a sunset-thing. But hard to tell from the other side of a internet cable(/RFC1149/whatever) connection, so maybe it was and maybe it wasn't. Pink (involving high-up oxygen) and blue (lower-down nitrogen) aren't exactly unexpected hues in the sky, if they're on the edge of vision. I think the 'gold standard' would have to be the greens (or, of course, being completely obvious 'sky curtains', whatever colour(s) they're displaying) as being not a 'normal' sky-hue for pretty much every other event (sunset 'green flash' aside).
I think am a little bit
too northerly for a G4-G5. I had a first good look after midnight, and peeked out last at ~2AM (either side of astronomical midnight), and could not see any glow that I couldn't identify as probably more like noctiluscent clouds[1] and/or very indirect illumination from the nearest large towns/maybe-a-regional-city-of-note. But I'm rather used to the northern horizon hardly going very dark in summer as the Sun is barely 'over the pole'. And we're barely a month off that peak time. Even to the south, in the darker sky and thin enough to see many of the expected stars through, there were patches of clear cirrus fibratus (or similar, maybe undulatus or uncinus) in view.
I really keep meaning to check up when 'magnetic midnight' is, for me, to maybe better time my looking/going out. But a G4-5 is roughly relatable to a Kp of 8-9, give or take geomagnetic variation, and I'm apparently better placed to see Kp=7 (~G3 sourced) aurorae. With
maybe some luck with that at times. Better in the properly dark skies of midwinter, I find.
[1] Not really sure if they're this. All my life I've known that there's visible high clouds at night, in the right conditions, then a decade or two ago they announce the 'discovery' of NCs, and I'm wondering if I've just seen 'normal' night-time clouds and never actually seen whatever-it-is-that's-actually-truly-noctiluscent. Either because I've never looked up when they're there or because I've been distracted by all the non-noctiluscent clouds up there! ...see also "my northern horizon stays gloriously lit (i.e post-sunset blue, if generally clear) in summer" effect, above.