Solar Storm G2
Reported by NASA CCMC DONKI 236 days ago.
What the source measured
NASA CCMC DONKI reported: Moderate geomagnetic storm. High-latitude power systems may experience voltage alarms.
How we know
2 recorded sources include NASA CCMC DONKI; independence is not established by this count.
Our own score for this event is 39 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 v1. 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 | Medium |
| Calamity Score (ours) | 39 / 100 |
| Legacy data-support index | 0.55/1 |
| Timestamp | 2026-03-13T21:00:00.000Z |
| Source | https://ccmc.gsfc.nasa.gov/DONKI/view/GST/45068/-1 |
| Licence | US public domain (NASA) · NASA CCMC DONKI |
Physical priority index · v1. 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: donki. Occurrence: 2026-03-13T21:00:00.000Z.
First archived: 2026-03-16T23:04:07.262Z. Material modification: not recorded.
Retained revisions are prospective; earlier versions may be unavailable. No revision entry does not prove that a record never changed.
Score breakdown
Technical details
| Scale | G2 |
| KpIndex | 6 |
| EventType | geomagnetic_storm |
| DonkiId | 2026-03-13T21:00:00-GST-001 |
| PowerGridRisk | minor |
| GpsRisk | minor |
| RadioRisk | fade |
| Soho Lasco ActivityId | 2026-03-13T18:12:00-CME-001 |
| Soho Lasco SpeedKms | 409 |
| Soho Lasco HalfAngleDeg | 10 |
| Soho Lasco IsHalo | false |
| Soho Lasco EarthDirected | false |
| Soho Lasco EventType | cme |
| Soho Lasco Note | Faint, narrow CME first seen to the SW in SOHO LASCO C2 beginning at 2026-03-13T18:12Z, as well as by SOHO LASCO C3 and partially in GOES CCOR-1, as this CME is partially obscured by the pylon. This CME is not visible in STEREO A COR2 due to a data gap which began at 2026-03-13T15:09Z. There is no c |
| MergedSources | [{"id":"soho_lasco_2026_03_13T18_12_00_CME_001","source":"soho_lasco","severity":"low","severityValue":20,"timestamp":1773425520000,"latitude":0,"longitude":0}] |
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 “after”.
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.