Daily Sunspot Evaluation
Observation Sheet Tuesday, 18 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)
- 6
- Number of spots (f)
- 31
- Relative number (R)
- 91
- Observer
- ET
- Reading
- all checks consistent
- File
- 19610718.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 4 | 2 | 68E | ||||
| 2 | B – 5 | -7 | 24E | ||||
| 3 | ? – 2 | -14 | 62E | ||||
| 4 | E – 14 | -7 | 59W | ||||
| 5 | ? – 1 | 4 | 80W | ||||
| 6 | J – 5 | 13 | 23W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.