Overview

• An X1.2-class solar flare erupted from Active Region 4114 on June 17 at 21:49 UTC.
• The flare produced an R3 strong radio blackout over the Pacific Ocean, notably disrupting shortwave communications in Hawaii.
• No coronal mass ejection was associated with the event, lowering the immediate risk of a severe geomagnetic storm.
• NOAA’s Space Weather Prediction Center forecasts a 75% chance of additional M-class flares and a 10% chance of further X-class eruptions through June 19.
• The geomagnetic field is expected to remain quiet to unsettled through June 19, with a slight chance of a G1 minor storm if an interplanetary shock arrives on June 18.