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Solar flares in August 2017
C-class91
M-class3
X-class0
LargestM1.82017-08-20
Sunspot number25.0NOAA SWPC
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| August 2016 | 27 | 1 | 0 | M1.3 |
| August 2017 | 91 | 3 | 0 | M1.8 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2017-08-20 | 01:34 | 01:52 | 29 | M1.8 | – | – |
| 2017-08-20 | 19:14 | 19:39 | 35 | M1.5 | – | – |
| 2017-08-19 | 21:24 | 21:55 | 41 | M1.1 | – | – |
| 2017-08-27 | 15:07 | 15:16 | 12 | C9.6 | – | – |
| 2017-08-21 | 03:03 | 03:17 | 27 | C9.3 | – | – |
| 2017-08-25 | 07:11 | 07:27 | 35 | C8.6 | – | – |
| 2017-08-30 | 18:30 | 18:45 | 20 | C8.2 | – | – |
| 2017-08-18 | 19:46 | 20:02 | 49 | C6.9 | – | – |
| 2017-08-19 | 01:26 | 01:37 | 25 | C5.5 | – | – |
| 2017-08-19 | 04:39 | 04:51 | 19 | C5.0 | – | – |
| 2017-08-21 | 17:46 | 17:57 | 15 | C4.8 | – | – |
| 2017-08-18 | 21:01 | 21:04 | 9 | C4.7 | – | – |
| 2017-08-20 | 07:39 | 07:50 | 15 | C4.7 | – | – |
| 2017-08-24 | 00:30 | 00:37 | 15 | C4.7 | – | – |
| 2017-08-29 | 02:50 | 03:00 | 17 | C4.4 | – | – |
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
94 flares of class C or larger in August 2017; by M/X count it ranks 366 of 565 months.