Daily Sunspot Evaluation
Observation Sheet Monday, 17 April 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)
- 6
- Number of spots (f)
- 27
- Relative number (R)
- 87
- Observer
- AK
- Reading
- all checks consistent
- File
- 19610417.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 8 | 65E | ||||
| 2 | B – 6 | -11 | 71E | ||||
| 3 | A – 1 | -9 | 21E | ||||
| 4 | A – 1 | 11 | 20W | ||||
| 5 | C – 13 | 14 | 10W | ||||
| 6 | H – 5 | 3 | 1W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.