Daily Sunspot Evaluation
Observation Sheet Thursday, 17 May 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)
- 10
- Number of spots (f)
- 47
- Relative number (R)
- 147
- Observer
- AK
- Reading
- all checks consistent
- File
- 19560517.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | B – 4 | 0.73 | 32 | |
| 2 | C – 7 | 0.92 | 93 | |
| 3 | A – 1 | 0.48 | 186 | |
| 4 | H – 1 | 0.4 | 198 | |
| 5 | C – 2 | 0.87 | 229 | |
| 6 | J – 1 | 0.94 | 231 | |
| 7 | J – 1 | 0.97 | 236 | |
| 8 | B – 4 | 0.76 | 281 | |
| 9 | E – 25 | 0.68 | 302 | |
| 10 | A – 1 | 0.52 | 310 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.