When did the The September 2017 X9.3 Flare occur?

The September 2017 X9.3 Flare occurred on September 6, 2017.

What was the Kp index during the The September 2017 X9.3 Flare?

The recorded Kp index reached 9 during this event.

The September 2017 X9.3 Flare

September 6, 2017Geomagnetic StormKp 9

What happened

The largest solar flare of Solar Cycle 24 — an X9.3 event from active region 12673 on September 6, 2017 — followed by an X8.2 flare on September 10. HF radio blackouts disrupted emergency communications during the Caribbean's Hurricane Irma response, and the associated CMEs produced a G4 geomagnetic storm with aurora visible across the northern United States and Europe.

Primary Scientific Record: NOAA Institutional Repository — Chamberlin et al. (2018), Space Weather Track Live Equivalent Conditions on SpaceWeatherTracker →

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Year: 2017