Solar Flare WatchHome › Flare history › 2005
X7.1 solar flare on 2005-01-20
ClassX7.1NOAA report
Peak07:012005-01-20 UTC
Duration50 min
Peak flux7.1e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 34 / 491 |
| Rank in year | 2 / 699 |
| Other M/X flares that day | 0 |
| M/X flares that month | 27 |
| Solar cycle | Cycle 23 |
| Position on disk | N14W61 |
| Active region | AR 10720 (88 flares) |
Compared with the strongest flares of 2005
X17.0
X7.1
X6.2
X5.4
X3.8
X3.6
X2.6
X2.1
X1.7
X1.7
X1.5
X1.3
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.
← X1.3 2005-01-19M8.0 2005-05-13 →
About this page
A X7.1 flare that began 2005-01-20 06:36 UTC; No. 2 of 699 C-class-or-larger flares in 2005.