Daily Sunspot Evaluation
Observation Sheet Thursday, 13 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)
- 4
- Number of spots (f)
- 5
- Relative number (R)
- 45
- Observer
- KA
- Reading
- all checks consistent
- File
- 19610413.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 15 | 41E | ||||
| 2 | J – 2 | 4 | 52E | ||||
| 3 | A – 1 | -29 | 26E | ||||
| 4 | J – 1 | -5 | 58W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.