Daily Sunspot Evaluation
Observation Sheet Wednesday, 18 April 1956
There is no typed record for this day. The values below were read by computer from the table on the sheet; when in doubt, see the drawing. Details →
- Number of groups (g)
- 18
- Number of spots (f)
- 61
- Relative number (R)
- 241
- Observer
- MH
- Reading
- all checks consistent
- File
- 19560418.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | A – 2 | 0.83 | 20 | |
| 2 | C – 3 | 0.92 | 25 | |
| 3 | D – 4 | 0.87 | 32 | |
| 4 | A – 5 | 0.83 | 45 | |
| 5 | A – 3 | 0.57 | 83 | |
| 6 | A – 1 | 0.3 | 153 | |
| 7 | A – 1 | 0.51 | 153 | |
| 8 | B – 2 | 0.5 | 184 | |
| 9 | G – 3 | 0.55 | 192 | |
| 10 | E – 13 | 0.61 | 216 | |
| 11 | H – 1 | 0.82 | 222 | |
| 12 | J – 1 | 0.63 | 269 | |
| 13 | J – 1 | 0.84 | 273 | |
| 14 | A – 2 | 0.59 | 281 | |
| 15 | C – 7 | 0.9 | 284 | |
| 16 | A – 6 | 0.51 | 293 | |
| 17 | C – 4 | 0.78 | 296 | |
| 18 | A – 2 | 0.47 | 309 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.