Daily Sunspot Evaluation
Observation Sheet Tuesday, 20 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)
- 19
- Relative number (R)
- 59
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19871020.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAI – 6 | -26 | 68W | 203 | 69W | 3.5 | 81 |
| 2 | CAO – 2 | -32 | 47W | 182 | 48W | 2.5 | 80 |
| 3 | CAI – 5 | -42 | 20E | 115 | 19E | 4 | 83 |
| 4 | CAI – 6 | -33 | 43E | 92 | 42E | 6.5 | 82 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.