A severe geomagnetic solar storm alert has been issued by NOAA’s Space Weather Prediction Center (SWPC) at 10:57 PM ET on Monday. This follows two Coronal Mass Ejections (CMEs) that occurred last Friday and Saturday.
Forecasters expect the storm to fluctuate between G2 and G3 levels through Tuesday night, with a potential for another period of G4 conditions. A G4 storm can cause voltage irregularities, increased drag on satellites in low Earth orbit, and intermittent disruptions to satellite navigation systems and high-frequency radio communications.
To mitigate potential power grid issues, the SWPC has activated the North American Reliability Corporation Hotline, providing regular updates to key partners including the FAA, NASA’s Space Radiation Analysis Group (SRAG), and FEMA. Residents in areas as far south as Alabama or northern California may be able to spot faint auroras.
The geomagnetic storm occurs when solar activity disturbs Earth’s magnetic field. Solar wind, a stream of charged particles released from the upper atmosphere of the Sun, drives these storms. When these particles interact with Earth’s magnetic field, they can cause various effects, including beautiful auroras and disruptions in power and communication systems.
As of September 17, 2024, solar activity remains at low levels. However, moderate to high levels are expected today, with a slight chance of X-class flares. The likelihood of M-class flares will decrease as Regions 3814 and 3822 rotate around the Northwest limb on September 18-19.
The current geomagnetic storm presents some exciting possibilities for aurora watchers, while agencies are prepared to manage any technological disruptions that may arise. Stay tuned for updates from Earth.com and SWPC as the situation develops!
Source: https://www.earth.com/news/severe-g4-geomagnetic-solar-storm-impacts-earth-auroras-expected-in-southern-united-states/