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Solar flares in December 2009
C-class14
M-class0
X-class0
LargestC7.62009-12-18
Sunspot number15.8NOAA SWPC
Flares per day (C and above)
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| December 2008 | 1 | 0 | 0 | C1.4 |
| December 2009 | 14 | 0 | 0 | C7.6 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 2009-12-18 | 18:48 | 18:55 | 10 | C7.6 | – | 11035 |
| 2009-12-22 | 04:50 | 04:56 | 10 | C7.2 | S26W46 | 11036 |
| 2009-12-23 | 10:09 | 10:17 | 11 | C6.4 | S28W61 | 11036 |
| 2009-12-16 | 01:02 | 01:24 | 33 | C5.3 | N30W06 | 11035 |
| 2009-12-16 | 12:36 | 13:02 | 44 | C3.7 | – | 11035 |
| 2009-12-10 | 10:56 | 10:57 | 3 | C3.4 | – | – |
| 2009-12-19 | 00:10 | 00:14 | 7 | C2.9 | N30W46 | 11035 |
| 2009-12-21 | 07:09 | 07:17 | 13 | C2.5 | – | – |
| 2009-12-16 | 21:35 | 21:49 | 50 | C1.4 | N29W17 | 11035 |
| 2009-12-22 | 20:23 | 20:27 | 9 | C1.3 | – | – |
| 2009-12-22 | 15:10 | 15:26 | 25 | C1.1 | – | – |
| 2009-12-21 | 09:16 | 09:26 | 16 | C1.0 | – | – |
| 2009-12-22 | 14:00 | 14:10 | 20 | C1.0 | – | – |
| 2009-12-22 | 21:45 | 22:26 | 50 | 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
14 flares of class C or larger in December 2009; by M/X count it ranks 527 of 565 months.