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M7.9 solar flare on 1981-09-07
ClassM7.9NOAA report
Peak20:071981-09-07 UTC
Duration15 min
Peak flux7.9e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 52 / 4022 |
| Other M/X flares that day | 9 |
| M/X flares that month | 43 |
| Solar cycle | Cycle 21 |
| Position on disk | S13W83 |
| Active region | AR 3300 (28 flares) |
Compared with the strongest flares of 1981
X5.9
X5.5
X4.0
X3.6
X3.5
X3.1
X3.0
X2.7
X2.6
X2.5
X2.4
X2.3
Other M/X flares that day
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 00:05 | 00:11 | 27 | M5.7 | N10E40 | 3317 | |
| 00:56 | 01:00 | 14 | M2.0 | N10E47 | 3317 | |
| 01:17 | 01:21 | 12 | M1.0 | – | – | |
| 03:11 | 03:24 | 48 | M1.6 | S12W72 | 3300 | |
| 05:05 | 05:11 | 30 | M9.5 | N10E40 | 3317 | |
| 11:26 | 11:38 | 23 | M1.4 | – | – | |
| 12:17 | 12:18 | 21 | M2.9 | N15E31 | 3317 | |
| 20:55 | 20:57 | 9 | M1.9 | N09E35 | 3317 | |
| 22:23 | 22:26 | 11 | M4.2 | N10E27 | 3317 |
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.
← M9.5 1981-09-07M8.4 1981-09-10 →
About this page
A M7.9 flare that began 1981-09-07 20:06 UTC; No. 52 of 4,022 C-class-or-larger flares in 1981.