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Today one year ago: X9.3 solar flare

It has been many months since we've last seen a strong solar flare or even a decent sunspot region. It is no secret that we are well on our way to solar minimum. However, today exactly one year ago, our Sun looked very different compared to how it looks today. Multiple sunspot regions were visible but by far the most interesting sunspot region was sunspot region 2673. Sunspot region 2673 was on 6 September 2017 one of the most complex sunspot regions that we have seen this solar cycle and it erupted that day with an X9.3 (R3-strong) solar flare which will likely remain the strongest solar flare of the current solar cycle, solar cycle 24.

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Current data suggests there is a slight possibility for aurora to appear at the following high latitude regions in the near future

Whitehorse, YT, Yellowknife, NT
Anchorage, AK, Fairbanks, AK, Juneau, AK

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07:09 UTC - Solar flare

Moderate M4.28 flare from sunspot region 4055

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06:48 UTC - Radio Blackout

Minor R1 radio blackout in progress (≥M1 - current: M1.53)


06:24 UTC - Solar flare

Moderate M1.49 flare from sunspot region 4055

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06:06 UTC - Radio Blackout

Minor R1 radio blackout in progress (≥M1 - current: M1.16)


04:45 UTC - Geomagnetic activity

Active geomagnetic conditions (Kp4) Threshold Reached: 04:29 UTC

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Space weather facts

Last X-flare2025/03/28X1.1
Last M-flare2025/04/14M1.4
Last geomagnetic storm2025/04/06Kp5 (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
March 2025134.2 -20.4
April 2025132.1 -2.1
Last 30 days132.4 -10.7

This day in history*

Solar flares
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32023M1.5
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DstG
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*since 1994

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