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Solar flares in October 2017
C-class2
M-class1
X-class0
LargestM1.62017-10-20
Sunspot number12.9NOAA SWPC
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| October 2016 | 4 | 0 | 0 | C4.2 |
| October 2017 | 2 | 1 | 0 | M1.6 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2017-10-20 | 23:10 | 23:28 | 27 | M1.6 | – | – |
| 2017-10-05 | 13:18 | 13:41 | 31 | C1.6 | – | – |
| 2017-10-06 | 16:24 | 16:34 | 12 | C1.5 | – | – |
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.
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About this page
3 flares of class C or larger in October 2017; by M/X count it ranks 442 of 565 months.