The Sun has been on an absolute wild roll lately, and one of the results of its continued activity is some spectacular aurora activity.
Aurora, by contrast, is more situational. It occurs when particles from the solar wind slam into Earth's magnetic field, and are whisked away, accelerated along magnetic field lines to high latitudes close to the north or south poles, where they rain down into the upper atmosphere. There, they interact with atmospheric particles; these interactions generate the dancing green lights that shimmer across the sky.
The Sun is always emitting gusts of charged particles; however, it's only when the wind is particularly strong, following a solar outburst, that there's enough interactions to produce visible lightshows, sometimes down as far as the mid-latitudes. Being particularly active in the last year or two, the Sun has been spitting out a high number of powerful flares as it moves towards the peak of its normal, 11-year activity cycle.
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