Daily Sunspot Evaluation
Observation Sheet Saturday, 12 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)
- 12
- Relative number (R)
- 52
- Observer
- HM
- Reading
- all checks consistent
- File
- 19870912.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ARX – 1 | 24 | 35E | 243 | 33E | -77 | 66 |
| 2 | EAO – 5 | -22 | 63W | 341 | 65W | 13.72 | 64 |
| 3 | AXX – 3 | -26 | 00 | 278 | 02W | 2.74 | 65 |
| 4 | HAX – 3 | -32 | 48E | 230 | 46E | 2.576 | 67 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.