Solar Flare WatchHome › Flare history › 1981
X2.3 solar flare on 1981-09-15
ClassX2.3NOAA report
Peak21:141981-09-15 UTC
Duration15 min
Peak flux2.3e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 163 / 491 |
| Rank in year | 14 / 4022 |
| Other M/X flares that day | 4 |
| M/X flares that month | 43 |
| Solar cycle | Cycle 21 |
| Position on disk | N10W78 |
| Active region | AR 3317 (70 flares) |
Compared with the strongest flares of 1981
X5.9
X5.5
X4.0
X3.6
X3.5
X3.1
X3.0
X2.7
X2.6
X2.5
X2.4
X2.3
Other M/X flares that day
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 00:43 | 01:03 | 26 | M1.6 | – | 3317 | |
| 01:11 | 01:14 | 28 | M2.5 | – | – | |
| 13:41 | 13:50 | 14 | M1.1 | – | 3332 | |
| 15:13 | 19:18 | 316 | M1.1 | – | – |
All times UTC. Until June 2017 classes are NOAA's reports of the time (GOES-15 and earlier included a 0.7 scaling factor); later classes come from calibrated GOES-16/18 data, so the same flare reads about 1.4× larger. Do not compare the two periods directly.
← M8.4 1981-09-10X3.6 1981-10-07 →
About this page
A X2.3 flare that began 1981-09-15 21:13 UTC; No. 14 of 4,022 C-class-or-larger flares in 1981.