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X1.8 solar flare on 1991-03-16
ClassX1.8NOAA report
Peak00:501991-03-16 UTC
Duration22 min
Peak flux1.8e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 220 / 491 |
| Rank in year | 30 / 3297 |
| Other M/X flares that day | 4 |
| M/X flares that month | 123 |
| Solar cycle | Cycle 22 |
| Position on disk | S09E09 |
| 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 |
|---|---|---|---|---|---|---|
| 10:52 | 10:54 | 22 | M4.8 | S14E05 | 6545 | |
| 18:01 | 18:06 | 19 | M1.1 | S10W02 | 6545 | |
| 20:46 | 20:46 | 14 | M1.9 | S19W65 | 6538 | |
| 21:44 | 21:56 | 36 | M6.0 | S09W04 | 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.
← X1.8 1991-03-14M6.0 1991-03-16 →
About this page
A X1.8 flare that began 1991-03-16 00:47 UTC; No. 30 of 3,297 C-class-or-larger flares in 1991.