Solar Flare WatchHome › Flare history › Region ranking
Solar flares from active region 6566
C11
M5
X0
LargestM1.41991-04-12
Span9 days
Flares by day
2
2
4
2
2
4
All flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1991-04-04 | 01:57 | 01:59 | 10 | C1.8 | S26E54 | 6566 |
| 1991-04-04 | 17:22 | 17:22 | 21 | C1.2 | S20E44 | 6566 |
| 1991-04-08 | 12:46 | 12:54 | 18 | C1.3 | S23W04 | 6566 |
| 1991-04-08 | 18:11 | 18:16 | 46 | C2.0 | S23W07 | 6566 |
| 1991-04-09 | 03:17 | 03:17 | 10 | C1.7 | S22W13 | 6566 |
| 1991-04-09 | 18:27 | 18:47 | 62 | M1.0 | S19W22 | 6566 |
| 1991-04-09 | 22:35 | 22:47 | 29 | C3.4 | S20W23 | 6566 |
| 1991-04-09 | 23:29 | 23:56 | 44 | C3.6 | S18W25 | 6566 |
| 1991-04-10 | 02:03 | 02:07 | 21 | C3.1 | S20W24 | 6566 |
| 1991-04-10 | 22:18 | 22:24 | 36 | C6.0 | S19W35 | 6566 |
| 1991-04-11 | 02:24 | 02:26 | 15 | C5.9 | S21W39 | 6566 |
| 1991-04-11 | 03:21 | 03:34 | 79 | M1.0 | S20W41 | 6566 |
| 1991-04-12 | 00:42 | 00:45 | 7 | M1.2 | S20W55 | 6566 |
| 1991-04-12 | 04:21 | 04:23 | 6 | M1.0 | S18W55 | 6566 |
| 1991-04-12 | 04:40 | – | 26 | M1.4 | S18W55 | 6566 |
| 1991-04-12 | 23:20 | 23:25 | 12 | C5.5 | S22W62 | 6566 |
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 6566 produced 16 C+ flares between 1991-04-04 and 1991-04-12.