Solar Flare WatchHome › Flare history › 1984
M5.7 solar flare on 1984-05-21
ClassM5.7NOAA report
Peak03:261984-05-21 UTC
Duration99 min
Peak flux5.7e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 13 / 1262 |
| Other M/X flares that day | 1 |
| M/X flares that month | 26 |
| Solar cycle | Cycle 21 |
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
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.
← X10.1 1984-05-20X2.7 1984-05-21 →
About this page
A M5.7 flare that began 1984-05-21 02:18 UTC; No. 13 of 1,262 C-class-or-larger flares in 1984.