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Aurora 2015_10_07 (42) | by john.purvis
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Aurora 2015_10_07 (42)

Band with rays. Arc still visible

Kp = 6, University of Lancaster magnetometer = 109nT deviation from mean. Expansion phase on stackplots.

 

Source: Coronal hole with high speed solar wind.

Speed = 763.4 km/s

IMF = 7.2nT

IMF Bz = 6.8nT South

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Taken on October 7, 2015