Daily Sunspot Evaluation
Observation Sheet Saturday, 15 September 1951
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)
- 11
- Number of spots (f)
- 68
- Relative number (R)
- 178
- Observer
- WG
- Reading
- all checks consistent
- File
- 19510915.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | B – 4 | 0.88 | 103 | |
| 2 | A – 1 | 0.67 | 106 | |
| 3 | A – 1 | 0.58 | 110 | |
| 4 | B – 7 | 0.38 | 172 | |
| 5 | C – 11 | 0.45 | 189 | |
| 6 | A – 2 | 0.44 | 215 | |
| 7 | C – 6 | 0.24 | 289 | |
| 8 | J – 1 | 0.97 | 290 | |
| 9 | A – 1 | 0.22 | 311 | |
| 10 | D – 31 | 0.02 | 314 | |
| 11 | A – 3 | 0.35 | 325 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.