Solar Flare WatchHome › Flare history › 1991
X1.3 solar flare on 1991-03-13
ClassX1.3NOAA report
Peak08:041991-03-13 UTC
Duration134 min
Peak flux1.3e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 306 / 491 |
| Rank in year | 40 / 3297 |
| Other M/X flares that day | 3 |
| M/X flares that month | 123 |
| Solar cycle | Cycle 22 |
| Position on disk | S11E43 |
| Active region | AR 6545 (57 flares) |
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 |
|---|---|---|---|---|---|---|
| 02:53 | 03:10 | 51 | M9.7 | S11E48 | – | |
| 07:30 | 07:33 | 12 | M1.4 | S09E46 | 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.
← M9.7 1991-03-13X3.9 1991-03-13 →
About this page
A X1.3 flare that began 1991-03-13 08:00 UTC; No. 40 of 3,297 C-class-or-larger flares in 1991.