Daily Sunspot Evaluation
Observation Sheet Thursday, 7 October 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)
- 3
- Number of spots (f)
- 13
- Relative number (R)
- 43
- Observer
- HA
- Reading
- all checks consistent
- File
- 19711007.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 9 | -3 | 33W | 75 | |||
| 2 | A – 1 | 6 | 33W | 75 | |||
| 3 | H – 3 | 10 | 40W | 82 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.