Daily Sunspot Evaluation
Observation Sheet Sunday, 17 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)
- 5
- Number of spots (f)
- 67
- Relative number (R)
- 117
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19810517.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAO – 3 | 12 | 58W | 212 | 57W | 11 | |
| 2 | FKC – 51 | 14 | 01E | 153 | 02E | 24 | |
| 3 | HAX – 1 | -6 | 46W | 200 | 45W | 125 | |
| 4 | CAO – 6 | -26 | 09W | 162 | 08W | 6 | |
| 5 | HKX – 6 | -25 | 36E | 118 | 37E | 5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.