Daily Sunspot Evaluation
Observation Sheet Wednesday, 9 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)
- 3
- Number of spots (f)
- 36
- Relative number (R)
- 66
- Observer
- FL
- Reading
- all checks consistent
- File
- 19870909.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HAX – 2 | 28 | 69E | 249 | 66E | 2.75 | 66 |
| 2 | EKC – 29 | -22 | 23W | 341 | 26W | 12.72 | 64 |
| 3 | CAI – 5 | -27 | 40E | 278 | 37E | 3.74 | 65 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.