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X4.7 solar flare on 1985-01-21
ClassX4.7NOAA report
Peak00:111985-01-21 UTC
Duration165 min
Peak flux4.7e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 59 / 491 |
| Rank in year | 1 / 193 |
| Other M/X flares that day | 6 |
| M/X flares that month | 9 |
| Solar cycle | Cycle 21 |
| Position on disk | S08W38 |
| Active region | AR 4617 (28 flares) |
Compared with the strongest flares of 1985
X4.7
X1.9
M4.9
M4.5
M4.1
M3.3
M2.9
M2.4
M2.2
M1.8
M1.3
M1.2
Other M/X flares that day
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 02:39 | 03:54 | 134 | M2.2 | S10W30 | 4617 | |
| 04:55 | 05:06 | 124 | M1.1 | S11W29 | 4617 | |
| 14:10 | 14:25 | 63 | M2.4 | S08W34 | 4617 | |
| 15:14 | 15:18 | 35 | M1.2 | – | 4617 | |
| 16:36 | 16:53 | 21 | M3.3 | S09W35 | 4617 | |
| 21:27 | 21:32 | 33 | M1.2 | S08W38 | 4617 |
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.
← M6.3 1984-05-22X1.9 1985-04-24 →
About this page
A X4.7 flare that began 1985-01-21 23:52 UTC; No. 1 of 193 C-class-or-larger flares in 1985.