Spaceweather.

SOLAR SECTOR BOUNDRY CROSSING: Last night, skies over Finland turned shocking green! What happened? Earth crossed through a fold in the heliospheric current sheet--a vast wavy structure that separates regions of positive and negative magnetic polarity in interplanetary space. This is called a "solar sector boundary crossing"; such crossings can cause geomagnetic disturbances around the poles.


Graham (G4FUJ)

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