Solar Flare WatchHome › Flare history › 1991
X5.5 solar flare on 1991-03-07
ClassX5.5NOAA report
Peak07:481991-03-07 UTC
Duration206 min
Peak flux5.5e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 49 / 491 |
| Rank in year | 11 / 3297 |
| Other M/X flares that day | 10 |
| M/X flares that month | 123 |
| Solar cycle | Cycle 22 |
| Position on disk | S20E66 |
| 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 |
|---|---|---|---|---|---|---|
| 07:05 | 07:10 | 10 | M1.8 | S23E64 | 6538 | |
| 08:08 | 09:20 | 247 | M2.5 | – | – | |
| 09:27 | 09:29 | 32 | M2.9 | S10E45 | 6537 | |
| 10:34 | 10:37 | 5 | M3.3 | – | – | |
| 12:48 | 12:59 | 39 | M3.5 | – | – | |
| 13:36 | 13:39 | 8 | M4.5 | S25E59 | 6538 | |
| 14:03 | 14:04 | 23 | M5.0 | S22E62 | 6538 | |
| 17:16 | 17:19 | 20 | M2.9 | S11E40 | 6537 | |
| 20:39 | 20:43 | 12 | M1.5 | S24E56 | 6538 | |
| 23:14 | 23:19 | 15 | X2.5 | S24E53 | 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.
← M6.2 1991-03-05M5.0 1991-03-07 →
About this page
A X5.5 flare that began 1991-03-07 06:11 UTC; No. 11 of 3,297 C-class-or-larger flares in 1991.