Solar Flare WatchHome › Flare history › 1991
M9.7 solar flare on 1991-03-13
ClassM9.7NOAA report
Peak03:101991-03-13 UTC
Duration51 min
Peak flux9.7e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 57 / 3297 |
| Other M/X flares that day | 3 |
| M/X flares that month | 123 |
| Solar cycle | Cycle 22 |
| Position on disk | S11E48 |
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 |
|---|---|---|---|---|---|---|
| 07:30 | 07:33 | 12 | M1.4 | S09E46 | 6545 | |
| 08:00 | 08:04 | 134 | X1.3 | S11E43 | 6545 | |
| 15:28 | 15:59 | 48 | X3.9 | S12E41 | 6545 |
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.
← X1.7 1991-03-12X1.3 1991-03-13 →
About this page
A M9.7 flare that began 1991-03-13 02:53 UTC; No. 57 of 3,297 C-class-or-larger flares in 1991.