Daily Sunspot Evaluation
Observation Sheet Friday, 11 September 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)
- 23
- Relative number (R)
- 63
- Observer
- HG
- Reading
- all checks consistent
- File
- 19870911.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ARX – 4 | 28 | 43E | 248 | 40E | 3.75 | 66 |
| 2 | EAO – 13 | -22 | 50W | 341 | 53W | 12.72 | 64 |
| 3 | AXX – 5 | -26 | 14E | 277 | 11E | 2.574 | 65 |
| 4 | HAX – 1 | -31 | 60E | 231 | 57E | 3.576 | 67 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.