Daily Sunspot Evaluation
Observation Sheet Friday, 12 June 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)
- 20
- Relative number (R)
- 70
- Observer
- OG
- Reading
- all checks consistent
- File
- 19810612.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DRO – 5 | 12 | 02W | 175 | 04W | 5 | |
| 2 | DRO – 5 | -24 | 22E | 151 | 20E | 7.5 | |
| 3 | HAX – 4 | -23 | 40E | 133 | 38E | 3 | |
| 4 | HAX – 4 | -25 | 60E | 113 | 58E | 8 | |
| 5 | ? – 2 | -20 | 76E | 97 | 74E | 7 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.