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Solar flares in December 2017
C-class2
M-class0
X-class0
LargestC1.22017-12-28
Sunspot number6.4NOAA SWPC
Flares per day (C and above)
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| December 2016 | 5 | 0 | 0 | C4.0 |
| December 2017 | 2 | 0 | 0 | C1.2 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2017-12-28 | 22:25 | 22:29 | 7 | C1.2 | – | – |
| 2017-12-22 | 01:36 | 01:50 | 29 | 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
2 flares of class C or larger in December 2017; by M/X count it ranks 547 of 565 months.