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>3am, at the lake, MN, having a beer and a smoke out on the dock.
>Dock faces directly north, watching northern lights to the northwest. View across the lake is unobstructed.
>The aurora is all white. Never seen that before, usually green.
>Watch this for about 5 mins.
>Begin to notice similar white light from directly north, but this is pulsing.
>Its getting slowly stronger and brighter. Pulses of light high in the atmosphere (or ionosphere or whatever). Still looks like some kind of 'northern lights'
>Its evenly timed about one pulse or flash per second.
>The light is stronger and now in clear shapes like boomerangs or waves, which are coming from the north.
>They continue getting stronger, not brighter, but the 'waves' are going further and further across the sky.
>This continues for about five minutes.
The only way I can explain it is like if pic related was real to scale, and the transmission was visible in the ionosphere.
I have no idea what it was.