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Solar flares in September 1978
C-class116
M-class14
X-class1
LargestX0.11978-09-23
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| September 1977 | 19 | 5 | 3 | X0.2 |
| September 1978 | 116 | 14 | 1 | X0.1 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1978-09-23 | 09:47 | 10:29 | 43 | X0.1 | N35W50 | 1294 |
| 1978-09-02 | 05:46 | 06:00 | 44 | M0.9 | S29E40 | 1272 |
| 1978-09-27 | 14:39 | 14:48 | 84 | M0.7 | N18W20 | 1304 |
| 1978-09-17 | 14:59 | 15:05 | 56 | M0.4 | N37E22 | 1294 |
| 1978-09-01 | 22:24 | 22:26 | 8 | M0.2 | S30E36 | 1272 |
| 1978-09-04 | 08:20 | 08:23 | 43 | M0.2 | S14E53 | 1280 |
| 1978-09-16 | 13:28 | 13:30 | 32 | M0.2 | N39E41 | 1294 |
| 1978-09-21 | 04:16 | 04:20 | 26 | M0.2 | N23E40 | 1301 |
| 1978-09-01 | 17:11 | 17:12 | 14 | M0.1 | S32E60 | 1277 |
| 1978-09-02 | 00:04 | 00:11 | 114 | M0.1 | S30E42 | 1272 |
| 1978-09-02 | 14:15 | 14:25 | 99 | M0.1 | S30E37 | 1272 |
| 1978-09-24 | 17:18 | 17:29 | 57 | M0.1 | N24E06 | 1301 |
| 1978-09-27 | 08:35 | 08:39 | 28 | M0.1 | N30W17 | 1304 |
| 1978-09-27 | 17:00 | 17:27 | 85 | M0.1 | N30W21 | 1304 |
| 1978-09-29 | 10:49 | 10:54 | 98 | M0.1 | S32E50 | – |
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
131 flares of class C or larger in September 1978; by M/X count it ranks 185 of 565 months.