The increase in Geomagnetic Activity is due to a Coronal Mass Ejection
CMEs, or Coronal Mass Ejections, are enormous bursts of superheated gas (called plasma) ejecting from the sun. They are powerful eruptions driven by kinks in the solar magnetic field.
As Earth’s magnetosphere continues to wain (due to both the GSM and Magnetic Excursion), CMEs will have a bigger impact on our modern way of life.
Perversely, a reduction in solar activity weakens Earth’s magnetic field but powerful CMEs can still occur, meaning we’ll be hit when our shields are down.
A G3 (Strong) geomagnetic storm warning is now in effect until 09:00 UTC on 26 Aug
— NOAA Space Weather (@NWSSWPC) August 26, 2018
— SpaceWeatherLive (@_SpaceWeather_) August 26, 2018
For a more detailed look at CMEs and their increasing threat going forward, click here.