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geomagnetic storm
I don't know about Melbourne. but the Sun could have gone out and Sydney wouldn't know about it.
Latest from 3D Sun:
GEOMAGNETIC STORM: A Kp=6 geomagnetic storm is in progress following the impact of a CME on March 7th (0400UT). Auroras spotted over northern-tier US States.
with an aurora photo from over Lake Superior.
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