Hurricane Irma did not have time to calm down, as a global geomagnetic storm appeared.
Invisible, but no less dangerous geomagnetic storm.
One of the strongest magnetic storms in the past 10 years.
A geomagnetic storm is a worldwide disturbance of the Earth’s magnetic field, associated with solar activity.
The geomagnetic field is expected to reach G1 (Minor) storm levels early on day one (13 Sep), with isolated G2 (Moderate) storm levels likely later in the day, due to initial influences from a CIR and subsequent onset of a positive polarity CH HSS.
G1 (Minor) levels are likely on days two and three (14-15 Sep) due to ongoing CH HSS effects.
B. NOAA Solar Radiation Activity Observation and Forecast
Solar radiation, as observed by NOAA GOES-13 over the past 24 hours, was above S-scale storm level thresholds.
Solar Radiation Storm Forecast for Sep 13-Sep 15 2017