Daily Sunspot Evaluation
Observation Sheet Saturday, 17 October 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)
- 4
- Number of spots (f)
- 30
- Relative number (R)
- 70
- Observer
- HG
- Reading
- all checks consistent
- File
- 19871017.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EKC – 17 | 22 | 20W | 195 | 21W | 9 | 78 |
| 2 | ARX – 1 | -29 | 64W | 239 | 65W | 1.5 | 79 |
| 3 | DKI – 9 | -25 | 35W | 210 | 36W | 10 | 81 |
| 4 | HKX – 3 | -31 | 09W | 184 | 10W | 3 | 80 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.