Last Saturday, scientists working on space weather phenomena were surprised to find extremely bright northern lights over Canada. They were very puzzled at first precisely because such a geomagnetic storm had not been seen.
However, they eventually came to a different conclusion, that the storm was in fact caused by a rare and harder-to-detect phenomenon known as the Sun’s spin-co-interaction region.
“At first [la tempesta] It was a surprise; Now the reason seems clear. a Interaction area co-alternating (CIR) hit the Earth’s magnetic field, opening a crack in our planet’s magnetosphere. The solar wind streamed in to trigger a rare solstice appearance of the aurora borealis,” SpaceWeather.com reports.
While coronal mass eruptions can be spotted blasting off the sun days before they reach Earth to make any impact, CIRs are more difficult to detect. Fortunately, this was from level G1, which is the lowest and least disturbing level.
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