Daily Sunspot Evaluation
Observation Sheet Thursday, 31 December 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)
- 20
- Relative number (R)
- 50
- Observer
- HG
- Reading
- all checks consistent
- File
- 19871231.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAO – 3 | -37 | 52W | 319 | 54W | 6.0 | 103 |
| 2 | PKI – 16 | -35 | 10E | 257 | 08E | 16.0 | 106 |
| 3 | AXX – 1 | -19 | 72E | 195 | 70E | 1.0 | 107 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.