Solar Flare WatchHome › Flare history › 1991
M8.2 solar flare on 1991-05-13
ClassM8.2NOAA report
Peak01:441991-05-13 UTC
Duration79 min
Peak flux8.2e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 64 / 3297 |
| Other M/X flares that day | 2 |
| M/X flares that month | 41 |
| Solar cycle | Cycle 22 |
Compared with the strongest flares of 1991
X12.0
X12.0
X12.0
X12.0
X12.0
X10.0
X10.0
X9.4
X7.1
X6.1
X5.5
X5.3
Other M/X flares that day
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 00:33 | 00:42 | 24 | M1.6 | – | – | |
| 05:06 | 05:13 | 21 | 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.
← X1.0 1991-04-20M8.9 1991-05-16 →
About this page
A M8.2 flare that began 1991-05-13 01:03 UTC; No. 64 of 3,297 C-class-or-larger flares in 1991.