Geomagnetic Storm Thursday Night and Friday

Strong Solar Geomagnetic Storm Predicted Overnight Tonight Through Friday 


Key Points  
  • A very energetic solar eruption was observed Tuesday afternoon that produced an R3 (strong) radio blackout and a S2 (moderate) solar radiation storm on Earth.
  • The most delayed aspect of a solar eruption is the arrival of the Coronal Mass Ejection (CME) which generally follows a day or two after the solar eruption and can cause a Geomagnetic Storm.
  • The NWS Space Weather Prediction Center (SWPC) is predicting the arrival of the CME from Tuesday's eruption to arrive at Earth during the early morning hours of Thursday EST.
  • Since the eruption was intense and Earth-directed, SWPC is predicting that the Geomagnetic Storm will be strong, or category G3.
  • All of this activity stems from "Region 1944" that had been relatively quiet until Tuesday.
  • Due to the nature of solar events, there will be very little new information until the time the CME reaches the NASA ACE spacecraft just upstream of Earth. Once it reaches those sensors, SWPC can issue short-term, higher-confidence warnings.
  • Region 1944 will be in a position to affect Earth for most of the next week as it continues to make its way across the sun, so subsequent activity is possible.

Potential Impacts from a G3 (Strong) Geomagnetic Storm

  • Power systems: 
    • Voltage corrections may be required, false alarms triggered on some protection devices.
  • Satellite operations: 
    • Surface charging may occur on satellite components, drag may increase on low-Earth-orbit satellites, and corrections may be needed for orientation problems.
  • Navigation Systems:
    • Temporary loss of some satellite links may cause reduced resolution and increased navigation errors.
  • Radio:
    • High Frequency radio communication likely will be disrupted.
  • Aurora:
    • Aurora may be visible across the northern United States.

Additional Information:

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