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Solar flares from active region 3397
C13
M4
X0
LargestM3.71981-10-15
Span8 days
Flares by day
1
6
1
1
4
3
1
All flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1981-10-10 | 16:58 | 17:02 | 49 | C4.4 | S20E43 | 3397 |
| 1981-10-11 | 04:35 | 04:35 | 25 | C5.0 | S20E36 | 3397 |
| 1981-10-11 | 12:24 | 12:25 | 67 | C5.2 | S20E31 | 3397 |
| 1981-10-11 | 14:26 | 14:37 | 34 | C4.4 | S19E31 | 3397 |
| 1981-10-11 | 15:06 | 15:13 | 30 | C4.3 | S19E30 | 3397 |
| 1981-10-11 | 15:52 | 16:01 | 88 | C5.3 | S20E29 | 3397 |
| 1981-10-11 | 18:04 | 18:04 | 50 | C1.9 | S20E31 | 3397 |
| 1981-10-12 | 16:29 | 16:32 | 51 | C3.6 | S23E13 | 3397 |
| 1981-10-13 | 23:04 | 23:11 | 24 | M1.1 | S21E01 | 3397 |
| 1981-10-15 | 04:43 | 04:44 | 25 | M2.0 | S21W14 | 3397 |
| 1981-10-15 | 05:52 | 05:56 | 28 | M3.7 | S24W19 | 3397 |
| 1981-10-15 | 15:40 | 15:42 | 17 | C2.7 | S24W24 | 3397 |
| 1981-10-15 | 20:36 | 20:42 | 29 | C7.7 | S24W27 | 3397 |
| 1981-10-16 | 05:28 | 05:29 | 10 | C3.2 | S20W27 | 3397 |
| 1981-10-16 | 12:44 | 12:48 | 39 | M2.9 | S19W36 | 3397 |
| 1981-10-16 | 18:47 | 18:51 | 10 | C1.9 | S19W38 | 3397 |
| 1981-10-17 | 02:55 | 03:04 | 35 | C2.2 | S20W41 | 3397 |
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 3397 produced 17 C+ flares between 1981-10-10 and 1981-10-17.