Solar Flare WatchStrongest X flares 1975 – Jun 2017 (NOAA reports)
X28.0
X20.0
X20.0
X17.2
X17.0
X15.0
X14.4
X13.0
X13.0
X12.9
X12.0
X12.0
X12.0
X12.0
X12.0
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2003-11-04 | 19:29 | 19:50 | 37 | X28.0 | S19W83 | 10486 |
| 1989-08-16 | 01:08 | 01:17 | 80 | X20.0 | S18W84 | 5629 |
| 2001-04-02 | 21:32 | 21:51 | 31 | X20.0 | – | 9393 |
| 2003-10-28 | 09:51 | 11:10 | 93 | X17.2 | S16E08 | 10486 |
| 2005-09-07 | 17:17 | 17:40 | 46 | X17.0 | S11E77 | 10808 |
| 1989-03-06 | 13:54 | 14:10 | 150 | X15.0 | N35E69 | 5395 |
| 2001-04-15 | 13:19 | 13:50 | 36 | X14.4 | S20W85 | 9415 |
| 1984-04-24 | 23:56 | 00:01 | 104 | X13.0 | S12E43 | 4474 |
| 1989-10-19 | 12:29 | 12:55 | 464 | X13.0 | S27E10 | 5747 |
| 1982-12-15 | 01:50 | 01:59 | 96 | X12.9 | S10E24 | 4026 |
| 1982-06-06 | 16:30 | 16:54 | 162 | X12.0 | S09E25 | 3763 |
| 1991-06-01 | 15:09 | 15:29 | 65 | X12.0 | N25E90 | 6659 |
| 1991-06-04 | 03:37 | – | 233 | X12.0 | N30E70 | 6659 |
| 1991-06-06 | 00:54 | 01:12 | 81 | X12.0 | N33E44 | 6659 |
| 1991-06-11 | 02:09 | 02:29 | 71 | X12.0 | N31W17 | 6659 |
| 1991-06-15 | 06:33 | 08:31 | 284 | X12.0 | N33W69 | 6659 |
| 1982-12-17 | 18:19 | 18:58 | 204 | X10.1 | S08W21 | 4025 |
| 1984-05-20 | 22:18 | 22:41 | 139 | X10.1 | S09E52 | 4492 |
| 1991-01-25 | 06:30 | 06:30 | 8 | X10.0 | S16E78 | 6471 |
| 1991-06-09 | 01:37 | 01:40 | 167 | X10.0 | N34E04 | 6659 |
| 2003-10-29 | 20:37 | 20:49 | 24 | X10.0 | S15W02 | 10486 |
| 1982-07-09 | 07:31 | 07:38 | 53 | X9.8 | N17E73 | 3804 |
| 1989-09-29 | 10:47 | 11:33 | 228 | X9.8 | – | 5698 |
| 1991-03-22 | 22:43 | 22:45 | 34 | X9.4 | S26E28 | 6555 |
| 1997-11-06 | 11:49 | 11:55 | 12 | X9.4 | S18W63 | 8100 |
| 1990-05-24 | 20:46 | 20:49 | 59 | X9.3 | N33W78 | 6063 |
| 1980-11-06 | 03:40 | 03:48 | 108 | X9.0 | S12E74 | 2779 |
| 1992-11-02 | 02:31 | 03:08 | 57 | X9.0 | – | 7321 |
| 2006-12-05 | 10:18 | 10:35 | 27 | X9.0 | S07E68 | 10930 |
| 2003-11-02 | 17:03 | 17:25 | 36 | X8.3 | S14W56 | 10486 |
| 1982-06-03 | 11:41 | 11:48 | 105 | X8.0 | S09E72 | 3763 |
| 1982-07-12 | 09:16 | 09:18 | 284 | X7.1 | N11E37 | 3804 |
| 1991-03-04 | 13:56 | 14:03 | 112 | X7.1 | – | – |
| 2005-01-20 | 06:36 | 07:01 | 50 | X7.1 | N14W61 | 10720 |
| 2011-08-09 | 07:48 | 08:05 | 20 | X6.9 | – | 11263 |
| 1989-03-17 | 17:29 | 17:37 | 123 | X6.5 | N33W60 | 5395 |
| 2006-12-06 | 18:29 | 18:47 | 31 | X6.5 | S05E64 | 10930 |
| 2001-12-13 | 14:20 | 14:30 | 15 | X6.2 | N16E09 | 9733 |
| 2005-09-09 | 19:13 | 20:04 | 83 | X6.2 | S12E67 | 10808 |
| 1991-10-27 | 05:38 | 05:49 | 80 | X6.1 | S13E15 | 6891 |
| 1981-04-24 | 13:46 | 14:11 | 229 | X5.9 | N18W50 | 3049 |
| 1982-06-04 | 13:13 | 13:30 | 45 | X5.9 | S10E55 | 3763 |
| 1989-10-24 | 17:36 | 18:31 | 528 | X5.7 | S30W57 | 5747 |
| 2000-07-14 | 10:03 | 10:24 | 40 | X5.7 | N22W07 | 9077 |
| 1988-06-24 | 16:44 | 16:48 | 94 | X5.6 | – | 5047 |
| 2001-04-06 | 19:10 | 19:21 | 21 | X5.6 | S21E31 | 9415 |
| 1981-04-27 | 07:20 | 08:20 | 145 | X5.5 | – | 3049 |
| 1990-05-21 | 22:12 | 22:17 | 87 | X5.5 | N35W36 | 6063 |
| 1991-03-07 | 06:11 | 07:48 | 206 | X5.5 | S20E66 | 6538 |
| 2003-10-23 | 08:19 | 08:35 | 30 | X5.4 | S21E88 | 10486 |
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.