Daily Sunspot Evaluation
Observation Sheet Friday, 15 May 1981
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)
- 7
- Number of spots (f)
- 85
- Relative number (R)
- 155
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19810515.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AXX – 1 | 8 | 68W | 249 | 67W | - | |
| 2 | DAO – 10 | 11 | 53W | 234 | 52W | 10 | |
| 3 | DKO – 11 | 12 | 31W | 212 | 30W | 10.75 | |
| 4 | FKC – 54 | 13 | 29E | 152 | 30E | 27 | |
| 5 | HAX – 2 | -6 | 19W | 200 | 18W | 1.25 | |
| 6 | CAO – 5 | -26 | 18E | 163 | 19E | 5 | |
| 7 | HKX – 2 | -25 | 62E | 119 | 63E | 4.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.