Daily Sunspot Evaluation
Observation Sheet Thursday, 21 August 1958
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)
- 12
- Number of spots (f)
- 98
- Relative number (R)
- 218
- Observer
- AB
- Reading
- all checks consistent
- File
- 19580821.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | F – 50 | 18 | 7E | ||||
| 2 | B – 9 | 21 | 35E | ||||
| 3 | A – 1 | 18 | 68E | ||||
| 4 | A – 1 | 10 | 55E | ||||
| 5 | ? – 3 | 8 | 78E | ||||
| 6 | C – 6 | 8 | 65E | ||||
| 7 | B – 2 | 6 | 5E | ||||
| 8 | A – 1 | -1 | 10E | ||||
| 9 | C – 13 | -18 | 36E | ||||
| 10 | C – 8 | -14 | 7E | ||||
| 11 | J – 3 | -12 | 38W | ||||
| 12 | A – 1 | 24 | 34W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.