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X2.5 solar flare on 1991-10-30
ClassX2.5NOAA report
Peak06:211991-10-30 UTC
Duration172 min
Peak flux2.5e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 149 / 491 |
| Rank in year | 19 / 3297 |
| Other M/X flares that day | 1 |
| M/X flares that month | 58 |
| Solar cycle | Cycle 22 |
| Position on disk | S08W25 |
| Active region | AR 6891 (81 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 |
|---|---|---|---|---|---|---|
| 19:13 | 19:16 | 17 | M4.3 | S10W35 | 6891 |
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.
← X6.1 1991-10-27M9.1 1991-11-02 →
About this page
A X2.5 flare that began 1991-10-30 06:11 UTC; No. 19 of 3,297 C-class-or-larger flares in 1991.