Solar Flare WatchHome › Flare history › 1991
M5.2 solar flare on 1991-10-04
ClassM5.2NOAA report
Peak19:281991-10-04 UTC
Duration54 min
Peak flux5.2e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 110 / 3297 |
| Other M/X flares that day | 1 |
| M/X flares that month | 58 |
| Solar cycle | Cycle 22 |
| Position on disk | N09E12 |
| Active region | AR 6861 (16 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 |
|---|---|---|---|---|---|---|
| 09:33 | 09:44 | 31 | M1.2 | S18W30 | 6853 |
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.
← M7.3 1991-09-29M6.0 1991-10-13 →
About this page
A M5.2 flare that began 1991-10-04 19:24 UTC; No. 110 of 3,297 C-class-or-larger flares in 1991.