Solar Flare WatchHome › Flare history › 1981
M5.4 solar flare on 1981-07-20
ClassM5.4NOAA report
Peak13:221981-07-20 UTC
Duration91 min
Peak flux5.4e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 66 / 4022 |
| Other M/X flares that day | 2 |
| M/X flares that month | 74 |
| Solar cycle | Cycle 21 |
| Position on disk | S26W75 |
| Active region | AR 3204 (23 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 |
|---|---|---|---|---|---|---|
| 17:29 | 17:32 | 61 | M3.8 | S07W89 | 3219 | |
| 23:29 | 23:47 | 60 | M2.0 | – | – |
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.
← X2.7 1981-07-19X1.0 1981-07-26 →
About this page
A M5.4 flare that began 1981-07-20 13:10 UTC; No. 66 of 4,022 C-class-or-larger flares in 1981.