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Solar flares from active region 2999
C14
M6
X3
LargestX2.31981-04-01
Span12 days
Flares by day
1
1
1
2
6
2
1
3
4
1
1
All flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1981-03-25 | 18:39 | 18:47 | 26 | C1.9 | S49E25 | 2999 |
| 1981-03-26 | 10:12 | 10:23 | 38 | C5.8 | – | 2999 |
| 1981-03-27 | 01:54 | 02:03 | 34 | C5.2 | S46E08 | 2999 |
| 1981-03-28 | 05:35 | 05:39 | 40 | M1.3 | S45W04 | 2999 |
| 1981-03-28 | 19:10 | 19:28 | 92 | C2.9 | S43W09 | 2999 |
| 1981-03-29 | 01:30 | 01:32 | 10 | C1.6 | S42W15 | 2999 |
| 1981-03-29 | 02:25 | 02:43 | 92 | C6.4 | S45W16 | 2999 |
| 1981-03-29 | 15:45 | 16:33 | 66 | C3.4 | S43W22 | 2999 |
| 1981-03-29 | 18:08 | 18:40 | 72 | C3.4 | S44W24 | 2999 |
| 1981-03-29 | 23:05 | 23:15 | 52 | C4.0 | S36W30 | 2999 |
| 1981-03-29 | 23:49 | 23:53 | 10 | C4.5 | – | 2999 |
| 1981-03-31 | 13:02 | 13:03 | 8 | C5.3 | S44W47 | 2999 |
| 1981-03-31 | 21:35 | 21:36 | 5 | C3.7 | S44W51 | 2999 |
| 1981-04-01 | 01:15 | 01:17 | 86 | X2.3 | S43W52 | 2999 |
| 1981-04-02 | 11:03 | 11:05 | 25 | X2.2 | S43W68 | 2999 |
| 1981-04-02 | 16:36 | 17:10 | 56 | M1.0 | – | 2999 |
| 1981-04-02 | 19:23 | 19:26 | 65 | C7.5 | S43W65 | 2999 |
| 1981-04-03 | 01:59 | 02:11 | 36 | M1.4 | S43W72 | 2999 |
| 1981-04-03 | 09:12 | 10:15 | 125 | M8.3 | – | 2999 |
| 1981-04-03 | 17:53 | 18:26 | 35 | M1.1 | – | 2999 |
| 1981-04-03 | 18:40 | 18:45 | 15 | M1.5 | – | 2999 |
| 1981-04-04 | 05:02 | 05:03 | 3 | X1.9 | S44W85 | 2999 |
| 1981-04-05 | 00:21 | 00:57 | 59 | C9.5 | – | 2999 |
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 2999 produced 23 C+ flares between 1981-03-25 and 1981-04-05.