Daily Sunspot Evaluation
Observation Sheet Sunday, 31 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)
- 39
- Relative number (R)
- 109
- Observer
- OG
- Reading
- counts consistent, some coordinates doubtful
- File
- 19810531.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 4 | 19 | 73W | 46 | 76W | 4 | |
| 2 | BAC – 11 | 3 | 54W | 27 | 53W | 11.5 | |
| 3 | CAO – 3 | 5 | 13E | 320 | 10E | 4 | |
| 4 | HAR – 9 | 13 | 21E | 312 | 18E | 5 | |
| 5 | ? – 3 | 23 | 62E | 231 ⚠ | 59E | 5 | |
| 6 | ? – 3 | -13 | 72W | 46 | 76W | 2.5 | |
| 7 | HKI – 6 | -7 | 10W | 343 | 13W | 5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.