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X7.1 solar flare on 1991-03-04
ClassX7.1NOAA report
Peak14:031991-03-04 UTC
Duration112 min
Peak flux7.1e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 33 / 491 |
| Rank in year | 9 / 3297 |
| Other M/X flares that day | 6 |
| M/X flares that month | 123 |
| Solar cycle | Cycle 22 |
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 |
|---|---|---|---|---|---|---|
| 05:18 | 05:33 | 59 | M2.5 | – | – | |
| 11:32 | 11:40 | 61 | M1.4 | – | – | |
| 15:56 | 15:56 | 1 | M2.7 | N19E70 | 6536 | |
| 17:43 | 17:49 | 68 | M1.3 | N07W36 | 6529 | |
| 19:14 | 19:34 | 130 | M2.0 | – | – | |
| 23:59 | 00:09 | 29 | M6.7 | – | – |
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.
← X1.2 1991-02-25M6.7 1991-03-04 →
About this page
A X7.1 flare that began 1991-03-04 13:56 UTC; No. 9 of 3,297 C-class-or-larger flares in 1991.