Daily Sunspot Evaluation
Observation Sheet Wednesday, 13 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)
- 9
- Number of spots (f)
- 97
- Relative number (R)
- 187
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19810513.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BRO – 3 | 8 | 41W | 251 | 43W | 4.5 | |
| 2 | BRX – 1 | 14 | 27W | 237 | 29W | 0.5 | |
| 3 | EAC – 44 | 10 | 21W | 231 | 23W | 13.5 | |
| 4 | DAO – 7 | 12 | 01E | 209 | 01W | .9 | |
| 5 | AXX – 1 | 11 | 43E | 167 | 41E | - | |
| 6 | BXO – 3 | 6 | 52E | 158 | 50E | .5 | |
| 7 | FKC – 36 | 12 | 60E | 150 | 58E | 26 | |
| 8 | ARX – 1 | -23 | 42W | 252 | 44W | 0.5 | |
| 9 | HAX – 1 | -7 | 11E | 199 | 09E | 1.75 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.