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Solar flares from active region 4912
C20
M2
X1
LargestX1.41988-01-02
Span9 days
Flares by day
3
3
6
6
1
1
2
1
All flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1987-12-25 | 17:34 | 17:36 | 5 | C1.0 | – | 4912 |
| 1987-12-25 | 19:03 | 19:03 | 34 | C2.5 | S32E69 | 4912 |
| 1987-12-25 | 20:41 | 20:50 | 25 | C2.2 | S34E76 | 4912 |
| 1987-12-26 | 01:52 | 02:16 | 44 | C4.6 | S34E76 | 4912 |
| 1987-12-26 | 18:04 | 18:05 | 23 | M1.8 | S33E66 | 4912 |
| 1987-12-26 | 19:40 | 20:16 | 102 | M1.1 | S34E62 | 4912 |
| 1987-12-27 | 07:14 | 07:19 | 18 | C5.5 | S34E62 | 4912 |
| 1987-12-27 | 12:26 | 12:47 | 27 | C1.3 | S34E62 | 4912 |
| 1987-12-27 | 13:24 | 13:25 | 6 | C1.3 | S35E62 | 4912 |
| 1987-12-27 | 17:56 | 17:57 | 31 | C3.1 | S33E61 | 4912 |
| 1987-12-27 | 21:29 | 21:34 | 47 | C4.4 | S33E55 | 4912 |
| 1987-12-27 | 23:02 | 23:03 | 7 | C1.1 | S34E58 | 4912 |
| 1987-12-28 | 01:48 | 01:49 | 5 | C1.3 | S35E57 | 4912 |
| 1987-12-28 | 04:16 | 04:18 | 17 | C1.8 | S33E50 | 4912 |
| 1987-12-28 | 06:05 | 06:10 | 28 | C7.3 | S34E51 | 4912 |
| 1987-12-28 | 14:21 | 14:25 | 22 | C1.4 | S35E46 | 4912 |
| 1987-12-28 | 15:37 | 15:40 | 23 | C1.1 | S35E50 | 4912 |
| 1987-12-28 | 18:31 | 18:36 | 23 | C1.1 | S34E45 | 4912 |
| 1987-12-29 | 23:22 | 23:22 | 31 | C1.7 | S36E34 | 4912 |
| 1987-12-30 | 01:42 | 01:49 | 38 | C4.1 | S36E32 | 4912 |
| 1988-01-01 | 09:03 | 09:19 | 33 | C1.1 | – | 4912 |
| 1988-01-01 | 09:40 | 10:55 | 200 | C2.0 | – | 4912 |
| 1988-01-02 | 21:11 | 21:35 | 178 | X1.4 | S34W18 | 4912 |
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 4912 produced 23 C+ flares between 1987-12-25 and 1988-01-02.