Solar Flare WatchHome › Flare history › Region ranking
Solar flares from active region 2911
C21
M18
X1
LargestX2.11981-01-25
Span12 days
Flares by day
11
6
3
3
3
3
5
3
1
1
1
All flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1981-01-25 | 04:08 | 04:14 | 22 | C7.8 | S14E91 | 2911 |
| 1981-01-25 | 05:01 | 05:04 | 12 | C2.3 | – | 2911 |
| 1981-01-25 | 05:18 | 06:28 | 106 | M5.9 | – | 2911 |
| 1981-01-25 | 07:43 | 07:47 | 18 | X2.1 | – | 2911 |
| 1981-01-25 | 08:46 | 09:08 | 68 | M9.0 | – | 2911 |
| 1981-01-25 | 11:32 | 11:35 | 10 | M1.1 | – | 2911 |
| 1981-01-25 | 12:50 | 12:53 | 30 | C7.8 | – | 2911 |
| 1981-01-25 | 16:46 | 16:47 | 11 | M2.4 | S13E75 | 2911 |
| 1981-01-25 | 19:07 | 19:11 | 18 | M1.3 | S13E90 | 2911 |
| 1981-01-25 | 20:52 | 20:55 | 11 | M1.3 | – | 2911 |
| 1981-01-25 | 23:48 | 23:49 | 7 | M1.9 | S15E95 | 2911 |
| 1981-01-26 | 02:00 | 02:14 | 37 | M2.6 | S14E84 | 2911 |
| 1981-01-26 | 02:56 | 03:13 | 41 | M2.9 | S12E85 | 2911 |
| 1981-01-26 | 04:09 | 04:12 | 19 | M1.6 | – | 2911 |
| 1981-01-26 | 09:15 | 09:25 | 39 | M1.6 | S15E79 | 2911 |
| 1981-01-26 | 17:08 | 17:19 | 52 | C6.4 | S14E75 | 2911 |
| 1981-01-26 | 19:49 | 20:06 | 67 | C6.9 | S13E71 | 2911 |
| 1981-01-27 | 05:32 | 05:36 | 11 | M1.6 | – | 2911 |
| 1981-01-27 | 15:40 | 15:47 | 54 | M4.6 | S13E63 | 2911 |
| 1981-01-27 | 17:34 | 17:43 | 10 | C3.8 | S14E56 | 2911 |
| 1981-01-28 | 02:05 | 02:15 | 64 | M1.7 | S13E54 | 2911 |
| 1981-01-28 | 04:12 | 04:22 | 10 | M8.3 | S13E57 | 2911 |
| 1981-01-28 | 06:11 | 06:13 | 26 | C8.0 | S13E54 | 2911 |
| 1981-01-29 | 00:24 | 00:33 | 21 | M1.2 | S13E42 | 2911 |
| 1981-01-29 | 04:09 | 04:12 | 8 | C7.8 | S12E43 | 2911 |
| 1981-01-29 | 14:44 | 14:44 | 6 | C4.4 | S13E36 | 2911 |
| 1981-01-30 | 04:57 | 05:07 | 90 | C2.0 | S12E27 | 2911 |
| 1981-01-30 | 07:20 | 07:28 | 12 | C1.8 | S12E25 | 2911 |
| 1981-01-30 | 20:18 | 20:21 | 10 | C3.6 | S12E16 | 2911 |
| 1981-01-31 | 08:36 | 08:39 | 27 | C2.2 | S14E15 | 2911 |
| 1981-01-31 | 11:30 | 11:35 | 10 | M2.1 | – | 2911 |
| 1981-01-31 | 12:36 | 12:42 | 13 | C7.4 | – | 2911 |
| 1981-01-31 | 18:27 | 18:29 | 7 | C2.4 | S11E07 | 2911 |
| 1981-01-31 | 19:25 | 19:34 | 16 | C5.9 | S11E06 | 2911 |
| 1981-02-01 | 03:33 | 03:40 | 22 | C2.8 | S11E02 | 2911 |
| 1981-02-01 | 18:00 | 18:01 | 11 | C1.8 | S14W07 | 2911 |
| 1981-02-01 | 18:45 | 18:48 | 59 | C3.7 | S13W08 | 2911 |
| 1981-02-03 | 09:22 | 09:25 | 22 | C1.9 | S16W27 | 2911 |
| 1981-02-04 | 01:13 | 01:22 | 32 | C6.3 | S14W31 | 2911 |
| 1981-02-05 | 22:22 | 22:38 | 113 | M1.5 | S15W60 | 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.
About this page
NOAA active region 2911 produced 40 C+ flares between 1981-01-25 and 1981-02-05.