Solar Flare WatchSolar flares in 1999
C1851
M170
X4
LargestX1.81999-10-14
M/X flares by month
- January 1999
- February 1999
- March 1999
- April 1999
- May 1999
- June 1999
- July 1999
- August 1999
- September 1999
- October 1999
- November 1999
- December 1999
Nearby years (M + X)
25
11
5
24
108
174
232
331
231
180
134
Top 20 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1999-10-14 | 08:54 | 09:00 | 9 | X1.8 | N11E32 | 8731 |
| 1999-08-02 | 21:18 | 21:25 | 20 | X1.4 | S18W46 | 8647 |
| 1999-11-27 | 12:05 | 12:12 | 11 | X1.4 | S15W68 | 8771 |
| 1999-08-28 | 17:52 | 18:05 | 26 | X1.1 | S26W14 | 8674 |
| 1999-08-20 | 23:03 | 23:08 | 7 | M9.8 | S25E64 | 8674 |
| 1999-11-14 | 07:54 | 08:01 | 10 | M8.0 | S15E27 | 8763 |
| 1999-05-09 | 17:53 | 18:07 | 22 | M7.6 | – | 8537 |
| 1999-11-17 | 09:47 | 09:57 | 15 | M7.4 | N17E21 | 8766 |
| 1999-02-28 | 16:31 | 16:39 | 12 | M6.6 | N28W06 | – |
| 1999-03-16 | 21:34 | 21:41 | 12 | M6.2 | N23W39 | – |
| 1999-08-04 | 05:45 | 05:57 | 29 | M6.0 | S16W64 | 8647 |
| 1999-11-26 | 13:38 | 13:43 | 30 | M6.0 | S15W59 | 8778 |
| 1999-08-21 | 22:10 | 22:14 | 6 | M5.9 | S24E52 | 8674 |
| 1999-07-19 | 08:16 | 08:46 | 54 | M5.8 | N18E59 | – |
| 1999-11-26 | 01:10 | 01:23 | 28 | M5.7 | – | 8771 |
| 1999-11-14 | 15:47 | 16:07 | 26 | M5.6 | – | 8766 |
| 1999-08-27 | 12:50 | 13:07 | 32 | M5.5 | S23W09 | 8674 |
| 1999-04-04 | 05:15 | 05:25 | 15 | M5.4 | N18E72 | 8508 |
| 1999-12-22 | 18:52 | 19:04 | 16 | M5.3 | N24E19 | 8806 |
| 1999-01-20 | 19:06 | 20:04 | 114 | M5.2 | – | – |
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
2,025 flares of class C+ in 1999: 170 M-class and 4 X-class.