Space Weather Events
Coronal mass ejection — 2026-09-21 09:09 UTC
Faint CME observed to the NW in STEREO A COR2 and SOHO LASCO C2/C3, largely blocked by the pylon in GOES CCOR-1. The source is unclear, with a potential far-sided source on the STEREO A EUVI 195/304 west limb observed as brightening and field line movement starting around 2026-09-21T09:05Z, very close to the CME start time however. There are two additional field line movements near the NW limb in SDO AIA 171 starting around 2026-09-21T03:03Z and 2026-09-21T05:54Z, however these eruptions may be too early to be associated with this CME. Triangulation of the leading edge suggests the CME is far-sided.
| Event type | Coronal mass ejection |
|---|---|
| Date | |
| Flare class | — |
| CME speed | 347 km/s |
| CME analyses | 1 |
| Linked events | — |
| Instruments | STEREO A: SECCHI/COR2, SOHO: LASCO/C2, SOHO: LASCO/C3, GOES: CCOR-1 |
Research information from NASA DONKI, not an operational warning. NOAA SWPC is the official US source of space weather forecasts.
CME analyses
| Analysis | Time at 21.5 R☉ (UTC) | Speed (km/s) | Half angle (°) | Lat / lon (°) | Type | Technique | Model runs (WSA-ENLIL) |
|---|---|---|---|---|---|---|---|
| #1 (opens in a new tab) Most accurate (DONKI) | 2026-09-21T18:19Z | 347 | 12 | 49 / 148 | S | SWPC_CAT | — |
Analyses are measurements and modelled predictions submitted to DONKI; the "most accurate" mark is DONKI's own.
Provenance
| Source | NASA DONKI — Space Weather Events |
|---|---|
| Feed | DONKI CME |
| Provider data as of | not stated |
| First observed here | 12 Oct 2026, 20:02 EDT |
| Last observed here | 13 Oct 2026, 14:25 EDT |
| In latest snapshot | Yes |
| Record identifier | 4924f0ab-dde3-5555-9637-1f3d59296290 |
Local observation history
What this site observed; not complete provider history.
- — Added