Beautiful capture Greg.
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I seem to often get it at my dark site. Perhaps because its at 800 metres altitude.
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It's only 750m at my dark site which would explain why I don't get it as much
Seriously, it's hit and miss. I've been travelling with a mate past week. We saw it in the east from Parkes and Cowra and have been talking & trying to work it out.
I also got a time lapse video from SPSP that has low sparse cloud and high altitude skyglow, not as strong as yours.
https://vimeo.com/user4541365
If it's emission not refection, why is is stronger near the horizon and fainter overhead?
Near the horizon, there is additive effect of looking sideways into a thicker concentration of it. However there there are many stops of extinction present near the horizon to cancel out the additive effect of looking sideways into it?
Joe