Solar Flare WatchHome › Flare history › 1991
X1.0 solar flare on 1991-03-31
ClassX1.0NOAA report
Peak19:111991-03-31 UTC
Duration8 min
Peak flux1.0e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 413 / 491 |
| Rank in year | 48 / 3297 |
| Other M/X flares that day | 3 |
| M/X flares that month | 123 |
| Solar cycle | Cycle 22 |
| Position on disk | S22W88 |
| Active region | AR 6555 (79 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 |
|---|---|---|---|---|---|---|
| 08:12 | 08:19 | 29 | M1.5 | S24W80 | 6555 | |
| 16:59 | 16:59 | 6 | M2.4 | S23W89 | 6555 | |
| 19:27 | 20:34 | 272 | M6.3 | – | – |
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.
← X2.4 1991-03-29M6.3 1991-03-31 →
About this page
A X1.0 flare that began 1991-03-31 19:11 UTC; No. 48 of 3,297 C-class-or-larger flares in 1991.