Daily Sunspot Evaluation
Observation Sheet Tuesday, 18 August 1987
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)
- 3
- Number of spots (f)
- 25
- Relative number (R)
- 55
- Observer
- HM
- Reading
- all checks consistent
- File
- 19870818.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAO – 15 | -23 | 10E | 239 | 02E | 8.65 | 57 |
| 2 | CKS – 4 | -26 | 33W | 282 | 36W | 4.562 | 59 |
| 3 | CKS – 6 | -30 | 01E | 248 | 02W | 6.64 | 56 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.