Geomagnetic Storm Leads To Spectacular Northern Lights

March 18, 2015 2:21 PM

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The cosmos aligned to deliver a spectacular green light show for St. Patrick's Day. Two coronal mass ejections (CME) on Sunday led to a severe G4 geomagnetic storm and aurorean displays on Tuesday. Amateur astronomers and stargazers in the Northern Hemisphere were treated to a spectacular green and purple display across the night sky.

A CME is plasma (i.e., superheated matter with its own magnetic field) hurled from the sun. When the charged particles hit Earth's Northern Hemisphere, they sometimes trigger a geomagnetic storm that can affect power grids, cause radio blackouts, disrupt navigation systems and create auroral activit...

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