Solar Flare WatchHome › Flare history › 1984
M5.7 solar flare on 1984-04-20
ClassM5.7NOAA report
Peak19:431984-04-20 UTC
Duration80 min
Peak flux5.7e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 12 / 1262 |
| Other M/X flares that day | 4 |
| M/X flares that month | 39 |
| Solar cycle | Cycle 21 |
| Position on disk | N03W73 |
| Active region | AR 4471 (8 flares) |
Compared with the strongest flares of 1984
X13.0
X10.1
X4.1
X2.7
X2.3
X1.7
X1.0
M7.5
M7.2
M7.1
M6.3
M5.7
Other M/X flares that day
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 16:35 | 16:53 | 40 | M1.8 | S14E90 | – | |
| 21:33 | 21:40 | 32 | M1.8 | – | – | |
| 23:04 | 23:34 | 84 | M1.6 | N05W73 | 4471 | |
| 23:29 | 23:53 | 48 | M1.1 | – | 4471 |
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.
← X2.3 1984-02-17X1.7 1984-04-21 →
About this page
A M5.7 flare that began 1984-04-20 19:40 UTC; No. 12 of 1,262 C-class-or-larger flares in 1984.