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Strongest geomagnetic storm since 2003, X5.8 solar flare

The geomagnetic storm that commenced yesterday will go down in the record books as the strongest geomagnetic storm since the Halloween Solar Storms of 2003. The May 2024 storms thus far peaked at a Dst of -412 nT.

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Extreme G5 geomagnetic storm

For the first time since the Halloween Solar Storms of 2003 we have now officially reached the Extreme G5 geomagnetic storm threshold at 22:54 UTC.

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The maximum X-ray flux of the past two hours is:
M1.04

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Latest alerts

16:54 UTC - Solar flare

Moderate M1.04 flare from sunspot region 3990

alert


16:39 UTC - Radio Blackout

Minor R1 radio blackout in progress (≥M1 - current: M1.04)


12:18 UTC - Solar flare

Moderate M1.63 flare from sunspot region 3990

alert


12:00 UTC - Radio Blackout

Minor R1 radio blackout in progress (≥M1 - current: M1.59)


10:15 UTC - Solar flare

Moderate M1.08 flare from sunspot region 3990

alert


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Space weather facts

Last X-flare2025/01/04X1.85
Last M-flare2025/02/23M1.6
Last geomagnetic storm2025/02/19Kp5 (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
January 2025137 -17.5
February 2025154.3 +17.3
Last 30 days150.6 -11.5

This day in history*

Solar flares
12025M4.9
22024M2.6
32014M1.62
42025M1.6
52024M1.5
DstG
11988-97G2
21982-92G2
31990-82G1
41973-75G2
51957-73G2
*since 1994

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