Solar Flare WatchHome › Flare history › 1991
X1.5 solar flare on 1991-03-05
ClassX1.5NOAA report
Peak03:121991-03-05 UTC
Duration29 min
Peak flux1.5e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 265 / 491 |
| Rank in year | 34 / 3297 |
| Other M/X flares that day | 6 |
| M/X flares that month | 123 |
| Solar cycle | Cycle 22 |
| Position on disk | S23E88 |
| Active region | AR 6538 (60 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 |
|---|---|---|---|---|---|---|
| 02:19 | 02:26 | 41 | M1.5 | – | – | |
| 04:58 | 05:06 | 47 | M9.3 | – | – | |
| 06:15 | 06:28 | 18 | M1.4 | – | – | |
| 09:10 | 09:16 | 35 | X2.0 | S19E93 | 6538 | |
| 17:16 | 17:18 | 32 | X1.4 | S09E69 | 6537 | |
| 23:26 | 23:26 | 19 | M6.2 | S23E79 | 6538 |
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.
← M6.7 1991-03-04M9.3 1991-03-05 →
About this page
A X1.5 flare that began 1991-03-05 02:56 UTC; No. 34 of 3,297 C-class-or-larger flares in 1991.