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X2.2 solar flare on 1981-04-02
ClassX2.2NOAA report
Peak11:051981-04-02 UTC
Duration25 min
Peak flux2.2e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 176 / 491 |
| Rank in year | 16 / 4022 |
| Other M/X flares that day | 1 |
| M/X flares that month | 87 |
| Solar cycle | Cycle 21 |
| Position on disk | S43W68 |
| Active region | AR 2999 (23 flares) |
Compared with the strongest flares of 1981
X5.9
X5.5
X4.0
X3.6
X3.5
X3.1
X3.0
X2.7
X2.6
X2.5
X2.4
X2.3
Other M/X flares that day
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 16:36 | 17:10 | 56 | M1.0 | – | 2999 |
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.
← X2.3 1981-04-01M8.3 1981-04-03 →
About this page
A X2.2 flare that began 1981-04-02 11:03 UTC; No. 16 of 4,022 C-class-or-larger flares in 1981.