Solar Flare WatchHome › Flare history › 1991
M5.3 solar flare on 1991-03-18
ClassM5.3NOAA report
Peak17:311991-03-18 UTC
Duration56 min
Peak flux5.3e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 104 / 3297 |
| Other M/X flares that day | 5 |
| M/X flares that month | 123 |
| Solar cycle | Cycle 22 |
| Position on disk | S10W24 |
| 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 |
|---|---|---|---|---|---|---|
| 12:45 | 13:01 | 179 | M1.6 | – | – | |
| 17:03 | 17:08 | 21 | M1.0 | – | – | |
| 21:38 | 21:40 | 20 | M1.4 | S10W31 | 6545 | |
| 22:11 | 22:19 | 49 | M1.0 | S24E68 | 6555 | |
| 23:03 | 23:07 | 74 | M1.3 | S10W34 | 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.
← X1.0 1991-03-17M6.7 1991-03-19 →
About this page
A M5.3 flare that began 1991-03-18 17:13 UTC; No. 104 of 3,297 C-class-or-larger flares in 1991.