Daily Sunspot Evaluation
Observation Sheet Thursday, 13 July 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)
- 63
- Relative number (R)
- 103
- Observer
- KA
- Reading
- all checks consistent
- File
- 19610713.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 15 | 12 | 41E | ||||
| 2 | F – 42 | -7 | 8E | ||||
| 3 | B – 4 | -12 | 11W | ||||
| 4 | H – 2 | 2 | 14W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.