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X2.1 solar flare on 1981-01-25
ClassX2.1NOAA report
Peak07:471981-01-25 UTC
Duration18 min
Peak flux2.1e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 184 / 491 |
| Rank in year | 17 / 4022 |
| Other M/X flares that day | 11 |
| M/X flares that month | 29 |
| Solar cycle | Cycle 21 |
| Active region | AR 2911 (40 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 |
|---|---|---|---|---|---|---|
| 02:10 | 02:22 | 22 | M2.4 | – | – | |
| 05:18 | 06:28 | 106 | M5.9 | – | 2911 | |
| 07:05 | 07:10 | 45 | M1.2 | N18W26 | 2907 | |
| 08:29 | 08:33 | 13 | M2.5 | – | – | |
| 08:46 | 09:08 | 68 | M9.0 | – | 2911 | |
| 11:32 | 11:35 | 10 | M1.1 | – | 2911 | |
| 16:46 | 16:47 | 11 | M2.4 | S13E75 | 2911 | |
| 19:07 | 19:11 | 18 | M1.3 | S13E90 | 2911 | |
| 20:52 | 20:55 | 11 | M1.3 | – | 2911 | |
| 22:43 | 22:49 | 20 | M1.4 | – | – | |
| 23:48 | 23:49 | 7 | M1.9 | S15E95 | 2911 |
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.
← M5.9 1981-01-25M9.0 1981-01-25 →
About this page
A X2.1 flare that began 1981-01-25 07:43 UTC; No. 17 of 4,022 C-class-or-larger flares in 1981.