Daily Sunspot Evaluation
Observation Sheet Friday, 10 September 1971
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)
- 2
- Number of spots (f)
- 2
- Relative number (R)
- 22
- Observer
- HM
- Reading
- all checks consistent
- File
- 19710910.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | 13 | 81E | 319 | |||
| 2 | A – 1 | 17 | 57W | 95 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.