Solar Storm G3
Reported by NOAA Space Weather Prediction Center today.
What the source measured
NOAA Space Weather Prediction Center reported: Space Weather Message Code: ALTK07 Serial Number: 220 Issue Time: 2026 Oct 10 1927 UTC ALERT: Geomagnetic K-index of 7 Threshold Reached: 2026 Oct 10 1926 UTC Synoptic Period: 1800-2100 Active Warning: YES Noaa Scale: G3 - Strong Comment: NOAA Scale: G3 - Strong
How we know
3 recorded sources include NOAA Space Weather Prediction Center; independence is not established by this count.
Our own score for this event is 51 out of 100.
This is our versioned heuristic index, not source severity or a calibrated probability. Urban PEI does not count unique people.
Computed under scoring rules v5. Rows carrying other versions were judged by different rules and are not directly comparable.
Series begins 8 March 2026. Comparisons refer to that period only. Collection gap: 14-26 August 2026.
This data is aggregated algorithmically from scientific sources. Not a replacement for official emergency warnings.
Event data
| Type | Solar Storm |
| Severity | High |
| Calamity Score (ours) | 51 / 100 |
| Legacy data-support index | 0.71/1 |
| Timestamp | 2026-10-10T19:27:12.427Z |
| Source | https://www.swpc.noaa.gov/products/alerts-watches-and-warnings |
| Licence | US public domain · NOAA Space Weather Prediction Center |
Physical priority index · v5. Heuristic priority, not calibrated probability, predictive accuracy or damage. The legacy data-support index combines assigned source support and field availability. Urban PEI is distance-weighted and does not count unique people; zero does not establish that nobody is present. Model cards.
Source and revision timeline
Source: swpc. Occurrence: 2026-10-10T19:27:12.427Z.
First archived: 2026-07-05T00:23:52.743Z. Material modification: 2026-10-10T19:35:46.465Z.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
2026-10-10T18:05:12.431Z · model change
Index 56 → 51; version 1 → 5.
6 retained revisions changed source fields this page does not show; the index, severity and version stayed the same.
Score breakdown
Technical details
| Scale | G3 |
| KpIndex | 7 |
| CurrentKp | 7 |
| GLevel | 3 |
| PowerGridRisk | moderate |
| GpsRisk | degraded |
| RadioRisk | intermittent |
| HighRiskRegions | ["High-latitude regions (>50°)"] |
| EventType | geomagnetic_storm |
| Gfz Kp KpIndex | 7.33 |
| Gfz Kp LatestKp | 6.67 |
| Gfz Kp GScale | 3 |
| Gfz Kp GScaleLabel | G3 — Strong |
| Gfz Kp MaxKpToday | 7.33 |
| Gfz Kp AllKpValues | [2,3.333,2.667,2,3.667,7.333,6.667] |
| Gfz Kp EventType | geomagnetic_storm |
| Donki Scale | R2 |
| Donki KpIndex | 7 |
| Donki EventType | radio_blackout |
| Donki DonkiId | 2026-10-10T14:58:00-FLR-001 |
Cascade risks
Safety information
What to do in a solar storm
A solar storm is not dangerous to people on the ground: it can disturb power, radio and satellite navigation. What to do, from FEMA’s Ready.gov.
For this reportSolar Storm
Nothing to fear outdoors
The atmosphere protects people on the ground; you may even see an aurora.
NOAA SWPCBe ready for a power cut
Torch, batteries, charged phone, and a plan for medical devices that need power.
Ready.govDo not rely only on GPS
Satellite navigation and radio can be wrong or drop out for a while.
Ready.gov
Before, during, after. Here it is still “during”.
Before · When a storm is forecast
Charge what matters
Phones and power banks.
Medicines and devices
Ask your doctor how to store medicines and run devices without power.
Ready.gov (FEMA)
During · During the storm
Save electricity
If authorities ask, to avoid rolling blackouts.
Ready.gov (FEMA)
After · After a long power cut
Check the food
Throw away what stayed above 4 °C for more than two hours.
Ready.gov (FEMA)
If a life is in danger
Call your local emergency number
Questions people ask
Is a solar storm dangerous for my health?
No, not on the ground. It concerns power grids, satellites, radio and, at high latitudes, aircraft crews. Source: NOAA Space Weather Prediction Center.
Will I see the northern lights?
In strong storms the aurora can be seen far from the poles. Look north (south in the southern hemisphere) on a dark, clear night.