Daily Sunspot Evaluation
Observation Sheet Monday, 17 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
- 19870817.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAO – 10 | -23 | 24F | 238 | 21F | 4.5 | 57 |
| 2 | CKS – 3 | -26 | 19W | 281 | 22W | 5.62 | 54 |
| 3 | CKS – 12 | -30 | 15E | 247 | 12F | 8.64 | 56 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.