Solar Flare WatchHome › Flare history › 1991
X1.0 solar flare on 1991-03-17
ClassX1.0NOAA report
Peak21:261991-03-17 UTC
Duration131 min
Peak flux1.0e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 411 / 491 |
| Rank in year | 46 / 3297 |
| Other M/X flares that day | 7 |
| M/X flares that month | 123 |
| Solar cycle | Cycle 22 |
| Position on disk | S10W13 |
| 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 |
|---|---|---|---|---|---|---|
| 01:42 | 01:45 | 38 | M1.1 | S20W67 | 6538 | |
| 02:15 | 02:17 | 51 | M1.2 | S29E90 | 6555 | |
| 04:53 | 04:55 | 15 | M1.8 | S25E90 | 6555 | |
| 05:38 | 05:45 | 24 | M1.4 | S18W73 | 6538 | |
| 09:26 | 09:32 | 27 | M2.1 | S25E83 | 6555 | |
| 14:35 | 14:40 | 17 | M2.3 | S26E93 | 6555 | |
| 17:40 | 17:50 | 25 | M2.4 | S10W14 | 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.
← M6.0 1991-03-16M5.3 1991-03-18 →
About this page
A X1.0 flare that began 1991-03-17 20:54 UTC; No. 46 of 3,297 C-class-or-larger flares in 1991.