Solar Flare WatchHome › Flare history › 2004
X1.8 solar flare on 2004-07-15
ClassX1.8NOAA report
Peak01:412004-07-15 UTC
Duration18 min
Peak flux1.8e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 226 / 491 |
| Rank in year | 4 / 1046 |
| Other M/X flares that day | 1 |
| M/X flares that month | 39 |
| Solar cycle | Cycle 23 |
| Position on disk | S10E54 |
| Active region | AR 10649 (62 flares) |
Compared with the strongest flares of 2004
X3.6
X2.5
X2.0
X1.8
X1.8
X1.6
X1.3
X1.2
X1.1
X1.1
X1.0
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.
← M6.2 2004-07-14X1.6 2004-07-15 →
About this page
A X1.8 flare that began 2004-07-15 01:30 UTC; No. 4 of 1,046 C-class-or-larger flares in 2004.