Moderate M1.0 solar flare erupts at 01:56 UTC on October 19, 2025

A moderate M1.0 solar flare erupted at 01:56 UTC on October 19, 2025.

Today’s flares include five M-class flares reported over the past 24 hours, with no individual flare event reports listed for October 19, 2025.

In 24 hours to 00:30 UTC on October 19, solar activity reached high levels as five M-class flares were produced. The primary source was an active region in decay as it transited the west limb. No Earth-directed CMEs were detected in available imagery.

Solar activity is expected to remain low, with a chance for isolated R1 – Minor to R2 – Moderate events from October 19 to 21.

Active sunspot regions presently observed on the Earth-facing solar disk include AR 4246 (N25W93 – Beta), AR 4248 (N07W66 – Beta), AR 4252 (S12W14 – Beta), AR 4254 (N10E20 – Alpha), AR 4256 (S15E40 – Beta), AR 4257 (S10E60 – Alpha), and AR 4258 (S16W40 – Beta).

Over the past 24 hours, the greater than 2 MeV electron flux decreased to normal to moderate levels, while the greater than 10 MeV proton flux remained at background levels. The electron flux is expected to return to high levels from October 19 to 21, while the proton flux is forecast to remain at background levels.

Solar wind conditions were enhanced, likely due to glancing influences from coronal mass ejections that departed the Sun between October 13 and 15. The total magnetic field strength reached 21 nT, and the Bz component went as far south as -12 nT. Solar wind speeds increased from around 370 km/s to above 550 km/s after 15:00 UTC on October 18. Enhanced solar wind conditions are expected to persist through October 20, with the influence of a coronal hole high speed stream expected over October 19 to 21.

The geomagnetic field reached G2 – Moderate storm levels in response to glancing CME influences from eruptions that departed the Sun between October 13 and 15. Periods of active conditions and G1 – Minor storming are expected on October 19 due to continued CME influences followed by corotating interaction region effects. Additional periods of active conditions are likely on October 20 to 21 as negative polarity coronal hole high speed stream effects prevail.