Solar Flare WatchHome › Flare history › 1999
M5.5 solar flare on 1999-08-27
ClassM5.5NOAA report
Peak13:071999-08-27 UTC
Duration32 min
Peak flux5.5e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 17 / 2025 |
| Other M/X flares that day | 2 |
| M/X flares that month | 25 |
| Solar cycle | Cycle 23 |
| Position on disk | S23W09 |
| Active region | AR 8674 (29 flares) |
Compared with the strongest flares of 1999
X1.8
X1.4
X1.4
X1.1
M9.8
M8.0
M7.6
M7.4
M6.6
M6.2
M6.0
M6.0
Other M/X flares that day
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 01:22 | 01:37 | 29 | M3.0 | – | – | |
| 16:23 | 16:36 | 44 | M3.0 | S31E04 | 8674 |
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.
← M5.9 1999-08-21X1.1 1999-08-28 →
About this page
A M5.5 flare that began 1999-08-27 12:50 UTC; No. 17 of 2,025 C-class-or-larger flares in 1999.