Solar Flare WatchHome › Flare history › 1999
M7.6 solar flare on 1999-05-09
ClassM7.6NOAA report
Peak18:071999-05-09 UTC
Duration22 min
Peak flux7.6e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 7 / 2025 |
| Other M/X flares that day | 2 |
| M/X flares that month | 16 |
| Solar cycle | Cycle 23 |
| Active region | AR 8537 (6 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 |
|---|---|---|---|---|---|---|
| 00:36 | 00:47 | 22 | M1.1 | N21E69 | 8541 | |
| 11:52 | 12:27 | 56 | M1.0 | – | – |
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.
← M5.4 1999-04-04M5.8 1999-07-19 →
About this page
A M7.6 flare that began 1999-05-09 17:53 UTC; No. 7 of 2,025 C-class-or-larger flares in 1999.