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Wednesday, September 3rd, 2014
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Ringing Magnetosphere

Check that out. Best example I've seen yet of the earth's entire magnetic field "wobbling" after being struck by an external force — plasma, magnetic field, etc.

I figure the frequency of oscillation is about 0.00001157 Hz 😊

The graph is of the K-index from NOAA, which in turn reflects the state of the earth's magnetic field. The higher the K-index, the more it has swung away from its normally mostly neutral polarization. At 6 and above, I can typically photograph low-light auroras here in Montana.

#kindex

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