Daily Sunspot Evaluation
Observation Sheet Tuesday, 13 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)
- 30
- Relative number (R)
- 70
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19871013.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DKO – 16 | 20 | 37E | 191 | 35E | 10.5 | 78 |
| 2 | AXX – 3 | -28 | 32W | 260 | 34W | 3 | 77 |
| 3 | CAO – 9 | -27 | 15W | 243 | 17W | 5.5 | 79 |
| 4 | HAX – 2 | -31 | 43E | 185 | 41E | 2.5 | 80 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.