Daily Sunspot Evaluation
Observation Sheet Tuesday, 17 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)
- 17
- Number of spots (f)
- 98
- Relative number (R)
- 268
- Observer
- WG
- Reading
- all checks consistent
- File
- 19560417.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | B – 2 | 0.78 | 4 | |
| 2 | A – 1 | 0.92 | 26 | |
| 3 | A – 1 | 0.82 | 27 | |
| 4 | ? – 1 | 0.98 | 27 | |
| 5 | ? – 2 | 0.95 | 36 | |
| 6 | A – 1 | 0.93 | 49 | |
| 7 | B – 3 | 0.4 | 114 | |
| 8 | B – 3 | 0.54 | 136 | |
| 9 | H – 18 | 0.44 | 168 | |
| 10 | E – 26 | 0.43 | 207 | |
| 11 | H – 1 | 0.67 | 218 | |
| 12 | ? – 1 | 0.99 | 269 | |
| 13 | J – 2 | 0.71 | 280 | |
| 14 | B – 9 | 0.82 | 289 | |
| 15 | C – 9 | 0.46 | 290 | |
| 16 | A – 2 | 0.7 | 307 | |
| 17 | B – 16 | 0.4 | 326 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.