G4 – Severe or greater geomagnetic storm forecast, aurora likely as low as Alabama and California

A powerful X5.1 solar flare erupted from Active Region 4274 at 10:04 UTC on November 11.…

Major X5.1 solar flare erupts from Region 4274, producing large CME

This is the fifth X-class (the strongest) since November 4 and the fourth — and strongest…

Strong geomagnetic storm forecast for November 12, aurora as low as Pennsylvania, Iowa and Oregon

Solar activity increased significantly over the past 24 hours due to a long-duration X1.2 solar flare…

S1 – Minor Solar Radiation Storm in progress after X1.2 solar flare

Potential impacts from S1 – Minor Solar Radiation Storm include minor effects on polar high-frequency (HF)…

Major X1.2 solar flare erupts from Region 4274 producing fast CME

A Type II Radio Emission with an estimated velocity of 1 321 km/s was observed at…

Major X1.7 solar flare erupts from Earth-facing Region 4274, producing large CME

A Type II Radio Emission, with an estimated velocity of 804 km/s, and a Type IV…

Earth-directed CME produced by M7.4 solar flare, strong geomagnetic storm forecast

Solar activity reached high levels in 24 hours to 00:30 UTC on November 6 as Region…

G3 – Strong geomagnetic storm forecast for November 6-7, aurora as low as Pennsylvania to Iowa and Oregon

NOAA’s Space Weather Prediction Center (SWPC) issued a G3 – Strong Geomagnetic Storm Watch on November…

Solar activity increases to high levels, Earth-directed CMEs possible in days ahead

Two powerful X-class solar flares were recorded on November 4 — an X1.8 from Region 4274…

Major X1.8 solar flare erupts from Active Region 4274, CME produced

The event was associated with a Type IV Radio Emission, suggesting a strong coronal mass ejection…