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Solar flares in September 2005
C-class85
M-class26
X-class10
LargestX17.02005-09-07
Sunspot number39.2NOAA SWPC
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| September 2004 | 35 | 4 | 0 | M4.8 |
| September 2005 | 85 | 26 | 10 | X17.0 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2005-09-07 | 17:17 | 17:40 | 46 | X17.0 | S11E77 | 10808 |
| 2005-09-09 | 19:13 | 20:04 | 83 | X6.2 | S12E67 | 10808 |
| 2005-09-08 | 20:52 | 21:06 | 25 | X5.4 | S12E75 | 10808 |
| 2005-09-09 | 09:42 | 09:59 | 26 | X3.6 | S11E66 | 10808 |
| 2005-09-10 | 21:30 | 22:11 | 73 | X2.1 | S13E47 | 10808 |
| 2005-09-13 | 23:15 | 23:22 | 15 | X1.7 | – | 10808 |
| 2005-09-13 | 19:19 | 19:27 | 98 | X1.5 | – | 10808 |
| 2005-09-09 | 02:43 | 03:00 | 24 | X1.1 | S12E68 | 10808 |
| 2005-09-10 | 16:34 | 16:43 | 17 | X1.1 | S11E47 | 10808 |
| 2005-09-15 | 08:30 | 08:38 | 16 | X1.1 | – | 10808 |
| 2005-09-17 | 05:58 | 06:05 | 17 | M9.8 | – | 10808 |
| 2005-09-09 | 05:32 | 05:48 | 28 | M6.2 | S13E71 | 10808 |
| 2005-09-12 | 08:37 | 09:03 | 43 | M6.1 | – | 10808 |
| 2005-09-14 | 10:05 | 10:38 | 49 | M4.6 | – | – |
| 2005-09-16 | 01:41 | 01:49 | 15 | M4.4 | – | 10808 |
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
121 flares of class C or larger in September 2005; by M/X count it ranks 84 of 565 months.