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X4.9 solar flare on 2023-12-31
ClassX4.9GOES-16 science data
Peak21:552023-12-31 UTC
Duration31 min
Peak flux4.9e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (since Jun 2017) | 9 / 108 |
| Rank in year | 1 / 3209 |
| Other M/X flares that day | 1 |
| M/X flares that month | 25 |
| Solar cycle | Cycle 25 |
Compared with the strongest flares of 2023
X4.9
X2.8
X2.2
X2.0
X1.9
X1.6
X1.4
X1.2
X1.2
X1.1
X1.0
X1.0
Other M/X flares that day
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 18:44 | 19:12 | 55 | M1.0 | – | – |
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.
← M6.9 2023-12-15M5.1 2024-01-23 →
About this page
A X4.9 flare that began 2023-12-31 21:36 UTC; No. 1 of 3,209 C-class-or-larger flares in 2023.