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Solar flares in April 1977
C-class18
M-class2
X-class0
LargestM0.21977-04-13
Flares per day (C and above)
M/X flares per day
Same month a year earlier
| Month | C | M | X | Largest |
|---|---|---|---|---|
| April 1976 | 20 | 1 | 1 | X0.2 |
| April 1977 | 18 | 2 | 0 | M0.2 |
Top 15 flares
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 1977-04-13 | 23:34 | 23:44 | 25 | M0.2 | S21E58 | 807 |
| 1977-04-16 | 23:07 | 23:18 | 28 | M0.1 | S21E17 | 807 |
| 1977-04-13 | 21:30 | 21:32 | 14 | C0.9 | S21E59 | 807 |
| 1977-04-16 | 21:09 | 21:15 | 32 | C0.8 | S19E18 | 807 |
| 1977-04-13 | 17:27 | 17:29 | 9 | C0.7 | S20E62 | 807 |
| 1977-04-13 | 22:18 | 22:20 | 37 | C0.7 | S21E59 | 807 |
| 1977-04-17 | 10:50 | 10:59 | 26 | C0.6 | S21E10 | 807 |
| 1977-04-15 | 08:57 | 09:01 | 19 | C0.4 | S20E36 | 807 |
| 1977-04-19 | 07:25 | 07:28 | 5 | C0.3 | S20W11 | – |
| 1977-04-16 | 17:30 | 17:30 | 27 | C0.2 | S19E20 | 807 |
| 1977-04-07 | 02:54 | 02:54 | 10 | C0.1 | N19W72 | 804 |
| 1977-04-14 | 22:14 | 22:14 | 11 | C0.1 | S21E46 | 807 |
| 1977-04-15 | 01:53 | 01:56 | 21 | C0.1 | S22E42 | 807 |
| 1977-04-15 | 05:38 | 05:43 | 22 | C0.1 | S21E40 | 807 |
| 1977-04-16 | 11:41 | 11:48 | 16 | C0.1 | S18E21 | 807 |
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
20 flares of class C or larger in April 1977; by M/X count it ranks 376 of 565 months.