Daily Sunspot Evaluation
Observation Sheet Saturday, 21 October 1961
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)
- 4
- Number of spots (f)
- 17
- Relative number (R)
- 57
- Observer
- PO
- Reading
- all checks consistent
- File
- 19611021.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 4 | -7 | 41E | ||||
| 2 | A – 2 | -2 | 1E | ||||
| 3 | B – 9 | 8 | 26W | ||||
| 4 | T – 2 | 16 | 73E |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.