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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:
M1.91

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Latest alerts

Saturday, 29 March 2025
23:21 UTC - Solar flare

Moderate M1.91 flare from sunspot region 4048

alert


22:51 UTC - Radio Blackout

Minor R1 radio blackout in progress (≥M1 - current: M1.1)


21:57 UTC - Solar flare

Moderate M1.45 flare from sunspot region 4048

alert


21:36 UTC - Radio Blackout

Minor R1 radio blackout in progress (≥M1 - current: M1.11)


00:00 UTC - Solar flare

Moderate M1.79 flare

alert


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Space weather facts

Last X-flare2025/03/28X1.1
Last M-flare2025/03/28M1.7
Last geomagnetic storm2025/03/27Kp5 (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
February 2025154.6 +17.6
March 2025128.3 -26.4
Last 30 days128.3 -24

This day in history*

Solar flares
12001X2.45
22014X1.45
32023X1.2
42024M3.2
52001M3.13
DstG
11959-154G3
21979-129G3
31989-125G3
41957-121G4
51984-86G2
*since 1994

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