Daily Sunspot Evaluation
Observation Sheet Tuesday, 12 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)
- 15
- Number of spots (f)
- 82
- Relative number (R)
- 232
- Observer
- SM
- Reading
- all checks consistent
- File
- 19810512.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAO – 3 | 11 | 69W | 293 | 72W | 7 | |
| 2 | AXX – 1 | 17 | 69W | 293 | 72W | - | |
| 3 | AXX – 1 | 21 | 43W | 267 | 46W | - | |
| 4 | AXX – 1 | 13 | 13W | 237 | 16W | - | |
| 5 | EKC – 37 | 10 | 06W | 230 | 09W | 13 | |
| 6 | DAO – 9 | 12 | 15E | 209 | 12E | 9 | |
| 7 | AXX – 2 | 19 | 16E | 208 | 13E | - | |
| 8 | FKC – 13 | 12 | 67E | 157 | 64E | 15 | |
| 9 | AXX – 1 | 6 | 66E | 158 | 63E | - | |
| 10 | BXI – 3 | -18 | 50W | 274 | 53W | 4 | |
| 11 | AXX – 1 | -22 | 41W | 265 | 44W | - | |
| 12 | BXI – 4 | -22 | 30W | 254 | 33W | 4 | |
| 13 | AXX – 4 | -5 | 10W | 234 | 13W | - | |
| 14 | AXX – 1 | -11 | 12E | 212 | 09E | - | |
| 15 | HAX – 1 | -7 | 25E | 199 | 22E | 3 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.