Daily Sunspot Evaluation
Observation Sheet Thursday, 18 May 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)
- 5
- Number of spots (f)
- 19
- Relative number (R)
- 69
- Observer
- KA
- Reading
- all checks consistent
- File
- 19610518.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 9 | 15E | ||||
| 2 | ? – 3 | 14 | 70E | ||||
| 3 | B – 11 | -12 | 15E | ||||
| 4 | ? – 1 | 2 | 83E | ||||
| 5 | B – 3 | 4 | 6W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.