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Solar flares in September 1977
C-class19
M-class5
X-class3
LargestX0.21977-09-07
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| September 1976 | 9 | 0 | 0 | C0.4 |
| September 1977 | 19 | 5 | 3 | X0.2 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1977-09-07 | 22:27 | 22:33 | 6 | X0.2 | N10E90 | 889 |
| 1977-09-09 | 16:04 | 16:46 | 51 | X0.2 | N10E80 | 889 |
| 1977-09-19 | 10:28 | 10:38 | 100 | X0.2 | N08W58 | 889 |
| 1977-09-16 | 21:20 | 23:07 | 295 | M0.5 | N07W21 | 889 |
| 1977-09-18 | 00:19 | 00:35 | 35 | M0.2 | N07W33 | 889 |
| 1977-09-20 | 03:00 | 03:13 | 18 | M0.2 | N11W59 | 889 |
| 1977-09-25 | 13:39 | 13:50 | 26 | M0.1 | N14E82 | 898 |
| 1977-09-26 | 01:42 | 01:46 | 33 | M0.1 | N12E76 | 898 |
| 1977-09-25 | 16:58 | 17:01 | 18 | C0.8 | N14E80 | 898 |
| 1977-09-19 | 00:04 | 00:12 | 38 | C0.7 | N08W47 | 889 |
| 1977-09-26 | 05:30 | 05:35 | 40 | C0.5 | S27W40 | 892 |
| 1977-09-25 | 09:11 | 09:22 | 62 | C0.4 | S21W32 | 892 |
| 1977-09-10 | 04:54 | 05:30 | 51 | C0.3 | N05E71 | 889 |
| 1977-09-20 | 18:38 | 18:42 | 12 | C0.3 | N10W71 | 889 |
| 1977-09-25 | 19:01 | 19:02 | 2 | C0.3 | N28W02 | 896 |
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
27 flares of class C or larger in September 1977; by M/X count it ranks 261 of 565 months.