KP index is the next thing I look at, the bigger the better!!!.Negative & Positive cancels out allowing charged particles to stream toward Earth and blammo, 40-to-300 miles above our heads a wonder of the universe happens ~ in color ~ the AURORA!!! A negative polarity (-Bz) solar wind impacting the positive polarity Earth (that’s us, the big bar magnet in the sky) causes a coupling to occur and the energy flows through us. You just want that to be a negative number, period. Great quick visual to show if auroras are tame or wild. The green donut-ring aurora forecast simulation provided by NOAA (I’m in Alaska, USA so that’s our go-to).As an aurora enthusiast, here’s the main things I look for at a glance on this page:
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