Solar Flare WatchHome › Flare history › 2018
Solar flares in May 2018
C-class7
M-class0
X-class0
LargestC5.12018-05-28
Sunspot number13.1NOAA SWPC
Flares per day (C and above)
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| May 2017 | 5 | 0 | 0 | C3.3 |
| May 2018 | 7 | 0 | 0 | C5.1 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2018-05-28 | 17:03 | 17:14 | 14 | C5.1 | – | – |
| 2018-05-23 | 18:03 | 18:17 | 29 | C3.1 | – | – |
| 2018-05-24 | 12:22 | 12:30 | 13 | C1.4 | – | – |
| 2018-05-22 | 14:46 | 14:59 | 32 | C1.3 | – | – |
| 2018-05-23 | 13:01 | 13:05 | 8 | C1.2 | – | – |
| 2018-05-28 | 14:58 | 15:07 | 13 | C1.0 | – | – |
| 2018-05-28 | 16:26 | 16:36 | 13 | C1.0 | – | – |
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
7 flares of class C or larger in May 2018; by M/X count it ranks 551 of 565 months.