A good image there Graham. The gradient can be processed out.
One way is to apply HLVG filter (in PI its called ACDNR I think) to remove the excess green which light pollution usually is.
It will thow your nice teal green off so you'll have to rebalance.
There is a gradient technique using channels. I haven't used it in a while but in your case where the gradient is on one side only it would work really well.
You can PM me if interested for the procedure.
Greg.
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