On Thursday, a crack opened in Earth’s magnetic field and stayed open for nearly 14 hours, allowing Vecna and his minions through from the Upside Down. OK, perhaps not that last bit, but it did allow some powerful solar winds to pour through the hole, creating a geomagnetic storm that sparked some pretty epic aurora.
The crack in the magnet field was created by a rare phenomenon called a co-rotating interaction region (CIR) from the Sun. CIRs are large-scale plasma structures generated in the low and mid-latitude regions of the heliosphere – the region surrounding the Sun that includes the solar magnetic field and the solar winds – when fast and slow-moving streams of solar wind interact.
Like coronal mass ejections (CMEs), CIRs get flung out from the Sun towards Earth and can contain shockwaves and compressed magnetic fields that cause stormy space weather, which usually presents itself to us as pretty aurorae.
This one hit Earth’s magnetic field in the early hours of July 7 and caused a long-lasting G1-class geomagnetic storm. National Oceanic and Atmospheric Administration (NOAA) analysts suspect a CME was embedded in the solar wind ahead of the CIR, Spaceweather.com reports.
Don't worry, cracks in Earth's magnetic field are normal. The magnetic field acts as a shield to protect us from solar storms spat out by the Sun. It was thought they opened and closed relatively quickly but now we know they can stay open for hours. READ MORE...
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