Solar Flare WatchHome › Flare history › 2009
Solar flares in October 2009
C-class11
M-class0
X-class0
LargestC2.22009-10-28
Sunspot number7.0NOAA SWPC
Flares per day (C and above)
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2009-10-28 | 00:45 | 00:53 | 11 | C2.2 | N19W47 | 11029 |
| 2009-10-27 | 08:57 | 09:24 | 37 | C1.7 | – | – |
| 2009-10-25 | 02:10 | 02:26 | 27 | C1.5 | – | 11029 |
| 2009-10-27 | 10:12 | 10:21 | 22 | C1.4 | – | – |
| 2009-10-26 | 22:35 | 22:50 | 18 | C1.3 | N16W30 | 11029 |
| 2009-10-26 | 18:38 | 19:06 | 33 | C1.2 | N16W29 | 11029 |
| 2009-10-27 | 04:49 | 05:00 | 21 | C1.2 | – | – |
| 2009-10-27 | 07:05 | 07:24 | 25 | C1.2 | N15W34 | 11029 |
| 2009-10-27 | 10:55 | 11:00 | 12 | C1.1 | – | – |
| 2009-10-26 | 23:29 | 23:33 | 6 | C1.0 | N15W28 | 11029 |
| 2009-10-31 | 09:23 | 09:35 | 20 | C1.0 | – | 11029 |
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.
← September 2009December 2009 →
About this page
11 flares of class C or larger in October 2009; by M/X count it ranks 526 of 565 months.