Solar Flare WatchHome › Flare history › 1978
X1.5 solar flare on 1978-07-11
ClassX1.5NOAA report
Peak10:581978-07-11 UTC
Duration56 min
Peak flux1.5e-04W/m²
| Comparison | Value |
|---|---|
| Rank among X flares (1975 – Jun 2017) | 257 / 491 |
| Rank in year | 1 / 1141 |
| Other M/X flares that day | 6 |
| M/X flares that month | 38 |
| Solar cycle | Cycle 21 |
| Position on disk | N20E46 |
| Active region | AR 1203 (78 flares) |
Compared with the strongest flares of 1978
X1.5
M5.0
M3.0
M3.0
M3.0
M2.0
M2.0
M2.0
M2.0
M2.0
M2.0
M1.0
Other M/X flares that day
| Date | Begin | Peak | Min | Class | Location | Region |
|---|---|---|---|---|---|---|
| 00:54 | 00:55 | 11 | M0.2 | N17E47 | 1203 | |
| 03:59 | 04:05 | 7 | M0.1 | N18E55 | 1203 | |
| 16:42 | 16:50 | 24 | M0.1 | N18E41 | 1203 | |
| 20:22 | 20:33 | 49 | M0.1 | N18E39 | 1203 | |
| 22:15 | 22:31 | 66 | X0.2 | N18E38 | 1203 | |
| 23:54 | 00:14 | 56 | M0.1 | N18E37 | 1203 |
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.
← X0.3 1978-07-10X0.2 1978-07-11 →
About this page
A X1.5 flare that began 1978-07-11 10:54 UTC; No. 1 of 1,141 C-class-or-larger flares in 1978.