Stunning auroras dazzle as far south as Virginia, North Carolina and Arizona
“When the CME hit, the solar wind speed didn’t change much,” Murtagh said. “But what we did get was this kind of perfectly aligned magnetic cloud.”
Murtagh explained: Think of the coronal mass ejection as a magnet shot out from the sun. That magnet now interacts with the Earth’s magnetic field. Like two bar magnets, the fields connected in such a way that “just opened things up.” “The [sun’s] magnetic field coupled perfectly with Earth’s magnetic field, and the consequence was severe storming and beautiful aurora extending down into the mid-latitudes,” he said.NASA solar physicist Alex Young agreed that this G4 storm was harder to predict than most. For one thing, the sun was shooting off several coronal mass ejections, but none of them looked as though they were headed for Earth.
Those kinds of puffs are called stealth coronal mass ejections, which Young thinks kicked the geomagnetic activity up a notchYoung said we’re also in what some people loosely call “aurora season.” Auroral activity tends to pick up around the equinoxes, one of. A common explanation is that Earth’s magnetic field is aligned in an optimal position to receive charged particles from the sun, which spur geomagnetic and aurora activity.
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