Solar Flare WatchHome › Flare history › 1998
M7.7 solar flare on 1998-05-09
ClassM7.7NOAA report
Peak03:401998-05-09 UTC
Duration51 min
Peak flux7.7e-05W/m²
| Comparison | Value |
|---|---|
| Rank in year | 18 / 1296 |
| Other M/X flares that day | 0 |
| M/X flares that month | 17 |
| Solar cycle | Cycle 23 |
Compared with the strongest flares of 1998
X4.9
X3.9
X3.7
X3.3
X2.8
X2.7
X2.5
X2.2
X1.2
X1.2
X1.1
X1.0
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.
← X2.7 1998-05-06M6.7 1998-05-29 →
About this page
A M7.7 flare that began 1998-05-09 03:04 UTC; No. 18 of 1,296 C-class-or-larger flares in 1998.