Overview

• The X1.2 flare erupted at 21:49 UTC on June 17, triggering an R3 radio blackout over the Pacific Ocean, including Hawaii.
• The absence of an associated coronal mass ejection reduced the immediate risk of a geomagnetic storm.
• NOAA forecasts a 75% chance of further M-class flares and a 10% chance of additional X-class events through June 19, mainly from Active Regions 4114 and 4115.
• High-speed solar wind streams from coronal holes are expected to keep geomagnetic conditions unsettled with a slight chance of a G1–minor storm.
• Space weather agencies are monitoring the sunspot’s ongoing instability for potential disruptions to satellite communications, navigation and power grids.