4 thoughts on “Katherine Ellis”
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Mark McCaughrean says: Hmmm, in answer to my own question (!), the purple/white arc could indeed be just a section of the common 22 degree halo, even if the colouration is rather odd. When the Sun is high in the sky, parhelia lie quite some way outside the 22 degree halo: they only lie on the 22 degree halo when the Sun is on the horizon.
An example of this can be seen in a picture of own on Les Cowley’s OPOD:
http://www.atoptics.co.uk/fz683.htm
While the parhelion in that picture of mine lies on the circumscribed halo, outside the 22 degree halo, that’s a coincidence down to the exact geometry at the time I took the picture.
Still, I still find the colour of that arc in your picture, Katherine, rather peculiar, if it is the 22 degree halo.
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Mark McCaughrean says:
Very nice indeed; lovely saturated colours.
Not quite sure what the purple/white arc is though, starting on the parhelic circle a few degrees sunward of the parhelion, and then curving down towards the lower left; any ideas? Real or an optical effect in the camera?
Beate Blecher 
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Complimenting this marvellous photo – here is a Moon Dog, otherwise known as a Paraselene. Image courtesy of NASA’s APOD website page (image taken November 2014):-
http://apod.nasa.gov/apod/ap141211.html
Enjoy!
Laurence
This is a perfect example of my favourite sky, absolutely wonderful photo with the sundogs included for good measure !!