Solar Flare WatchHome › Flare history › 1999
M6.0 solar flare on 1999-08-04
ClassM6.0NOAA report
Peak05:571999-08-04 UTC
Duration29 min
Peak flux6.0e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 11 / 2025 |
| Other M/X flares that day | 1 |
| M/X flares that month | 25 |
| Solar cycle | Cycle 23 |
| Position on disk | S16W64 |
| Active region | AR 8647 (10 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 |
|---|---|---|---|---|---|---|
| 15:49 | 16:07 | 36 | M1.2 | S17W63 | 8647 |
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.
← X1.4 1999-08-02M9.8 1999-08-20 →
About this page
A M6.0 flare that began 1999-08-04 05:45 UTC; No. 11 of 2,025 C-class-or-larger flares in 1999.