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X4.9 solar flare on 1998-08-18
ClassX4.9NOAA report
Peak22:191998-08-18 UTC
Duration18 min
Peak flux4.9e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 56 / 491 |
| Rank in year | 1 / 1296 |
| Other M/X flares that day | 2 |
| M/X flares that month | 19 |
| Solar cycle | Cycle 23 |
| Position on disk | N33E87 |
| Active region | AR 8307 (18 flares) |
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
Other M/X flares that day
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.
← X2.8 1998-08-18X3.9 1998-08-19 →
About this page
A X4.9 flare that began 1998-08-18 22:10 UTC; No. 1 of 1,296 C-class-or-larger flares in 1998.