Daily Sunspot Evaluation
Observation Sheet Wednesday, 12 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)
- 8
- Number of spots (f)
- 37
- Relative number (R)
- 117
- Observer
- MH
- Reading
- all checks consistent
- File
- 19510912.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | J – 1 | 0.35 | 83 | |
| 2 | A – 1 | 106 | ||
| 3 | E – 20 | 111 | ||
| 4 | C – 8 | 135 | ||
| 5 | A – 1 | 145 | ||
| 6 | B – 4 | 268 | ||
| 7 | A – 1 | 273 | ||
| 8 | J – 1 | 281 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.