Daily Sunspot Evaluation
Observation Sheet Tuesday, 15 August 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)
- 9
- Number of spots (f)
- 50
- Relative number (R)
- 140
- Observer
- ET
- Reading
- all checks consistent
- File
- 19610815.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 17 | 8 | 13E | ||||
| 2 | A – 2 | 10 | 25E | ||||
| 3 | ? – 1 | 7 | 80E | ||||
| 4 | J – 2 | 1 | 48E | ||||
| 5 | A – 2 | 1 | 38E | ||||
| 6 | ? – 2 | -15 | 67E | ||||
| 7 | B – 3 | -2 | 10E | ||||
| 8 | B – 9 | -7 | 10W | ||||
| 9 | D – 12 | 13 | 15W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.