At first it just looked a greenish-blue glow in the sky, to the north, so it couldn't have just been the last of daylight disappearing overt the horizon. We watched it for a bit, it changed intensity a bit, but otherwise just a glow.
|The glow - you can make out the Bay and some light pollution.|
We decided to leave but before we even got back to the car, this appeared.
|Auroral array above the dunes|
For the next half an hour or so we watched the 'northern lights' which took various forms from shaft of light - green at the base turning purple - to a long arc of light across the sky with further beams of light radiating from it. All very impressive and to top it off we had a soundtrack of long-eared owls and water rail.
Thanks must go to David Steel, Hannah Bayman and the Nastromoners for the twitter updates.