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Solar flares in March 1999
C-class113
M-class11
X-class0
LargestM6.21999-03-16
Sunspot number100.4NOAA SWPC
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| March 1998 | 110 | 10 | 0 | M2.7 |
| March 1999 | 113 | 11 | 0 | M6.2 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1999-03-16 | 21:34 | 21:41 | 12 | M6.2 | N23W39 | – |
| 1999-03-18 | 08:25 | 08:31 | 10 | M3.3 | – | – |
| 1999-03-17 | 09:50 | 09:56 | 15 | M3.2 | N23W44 | – |
| 1999-03-08 | 06:30 | 06:37 | 13 | M2.6 | S24E93 | 8484 |
| 1999-03-14 | 01:19 | 01:27 | 21 | M2.1 | N15E39 | – |
| 1999-03-13 | 20:22 | 20:34 | 17 | M1.9 | N17E39 | 8487 |
| 1999-03-16 | 06:18 | 06:35 | 38 | M1.6 | N22W31 | – |
| 1999-03-17 | 14:42 | 14:49 | 16 | M1.2 | N23W46 | 8485 |
| 1999-03-14 | 09:08 | 10:10 | 77 | M1.1 | N16E34 | 8487 |
| 1999-03-15 | 03:17 | 03:36 | 33 | M1.1 | N16E26 | – |
| 1999-03-16 | 21:01 | 21:07 | 13 | M1.1 | N23W36 | – |
| 1999-03-17 | 21:45 | 21:56 | 15 | C9.5 | – | – |
| 1999-03-12 | 17:20 | 17:26 | 12 | C9.4 | N14E55 | 8487 |
| 1999-03-11 | 00:04 | 00:09 | 7 | C8.7 | S17W63 | 8483 |
| 1999-03-08 | 00:08 | 00:31 | 28 | C7.9 | – | – |
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
124 flares of class C or larger in March 1999; by M/X count it ranks 224 of 565 months.