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Solar flares in June 2018
C-class4
M-class0
X-class0
LargestC3.22018-06-21
Sunspot number14.5NOAA SWPC
Flares per day (C and above)
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| June 2017 | 17 | 0 | 0 | C8.0 |
| June 2018 | 4 | 0 | 0 | C3.2 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2018-06-21 | 01:07 | 01:15 | 11 | C3.2 | – | – |
| 2018-06-06 | 10:40 | 11:00 | 26 | C1.6 | – | – |
| 2018-06-24 | 01:29 | 01:45 | 22 | C1.3 | – | – |
| 2018-06-03 | 07:42 | 07:56 | 16 | C1.2 | – | – |
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
4 flares of class C or larger in June 2018; by M/X count it ranks 552 of 565 months.