Solar Flare WatchHome › Flare history › Region ranking
Solar flares from active region 4891
C13
M4
X0
LargestM3.51987-11-21
Span8 days
Flares by day
4
4
2
4
2
1
All flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1987-11-19 | 04:14 | 04:23 | 32 | C2.7 | S22E44 | 4891 |
| 1987-11-19 | 07:41 | 07:46 | 78 | M1.1 | S21E42 | 4891 |
| 1987-11-19 | 14:41 | 15:08 | 70 | C2.6 | S20E40 | 4891 |
| 1987-11-19 | 16:02 | 16:15 | 43 | C2.1 | S17E40 | 4891 |
| 1987-11-20 | 04:12 | 04:18 | 83 | M1.3 | S21E35 | 4891 |
| 1987-11-20 | 17:41 | 17:46 | 15 | C1.5 | S22E28 | 4891 |
| 1987-11-20 | 19:41 | 19:45 | 19 | C1.3 | S23E29 | 4891 |
| 1987-11-20 | 23:31 | 23:37 | 100 | M1.3 | S21E25 | 4891 |
| 1987-11-21 | 17:55 | 18:05 | 66 | M3.5 | S23E16 | 4891 |
| 1987-11-21 | 21:48 | 21:51 | 6 | C1.1 | – | 4891 |
| 1987-11-22 | 02:42 | 02:42 | 8 | C2.2 | S22E13 | 4891 |
| 1987-11-22 | 05:21 | 05:43 | 40 | C2.0 | S21E07 | 4891 |
| 1987-11-22 | 07:15 | 07:18 | 44 | C1.2 | S21E05 | 4891 |
| 1987-11-22 | 13:59 | 14:02 | 32 | C1.1 | S22E02 | 4891 |
| 1987-11-23 | 05:06 | 05:06 | 25 | C1.3 | S23W03 | 4891 |
| 1987-11-23 | 17:09 | 17:14 | 11 | C1.0 | – | 4891 |
| 1987-11-26 | 03:11 | 03:25 | 35 | C3.3 | S21W48 | 4891 |
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 4891 produced 17 C+ flares between 1987-11-19 and 1987-11-26.