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Solar flares in December 1991
C-class247
M-class91
X-class3
LargestX3.51991-12-20
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| December 1990 | 278 | 50 | 3 | X1.9 |
| December 1991 | 247 | 91 | 3 | X3.5 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1991-12-20 | 14:00 | 14:13 | 57 | X3.5 | S15E64 | 6982 |
| 1991-12-03 | 16:34 | 16:37 | 73 | X2.2 | N17E72 | 6952 |
| 1991-12-24 | 10:13 | 10:30 | 80 | X1.4 | S17E14 | 6982 |
| 1991-12-22 | 16:49 | 17:07 | 104 | M8.5 | S16E78 | 6985 |
| 1991-12-28 | 21:08 | 21:12 | 169 | M7.8 | S16W47 | 6982 |
| 1991-12-09 | 13:41 | 13:46 | 43 | M7.2 | N08E47 | 6961 |
| 1991-12-16 | 19:22 | 19:27 | 7 | M6.9 | – | 6961 |
| 1991-12-08 | 23:08 | 23:08 | 55 | M5.3 | N10E55 | 6961 |
| 1991-12-31 | 03:18 | 03:25 | 12 | M4.8 | – | – |
| 1991-12-23 | 11:52 | 12:44 | 109 | M4.7 | S16E29 | 6982 |
| 1991-12-26 | 10:47 | 10:50 | 7 | M4.6 | – | – |
| 1991-12-30 | 09:53 | 10:21 | 37 | M4.6 | S17W23 | 6985 |
| 1991-12-30 | 23:02 | 23:07 | 33 | M4.6 | S15E32 | 6985 |
| 1991-12-23 | 21:32 | 21:39 | 19 | M4.5 | – | – |
| 1991-12-26 | 21:37 | 21:39 | 37 | M4.2 | S16E23 | 6985 |
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
341 flares of class C or larger in December 1991; by M/X count it ranks 11 of 565 months.