Daily Sunspot Evaluation
Observation Sheet Friday, 10 July 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)
- 6
- Number of spots (f)
- 64
- Relative number (R)
- 124
- Observer
- GT
- Reading
- all checks consistent
- File
- 19810710.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HAX – 4 | 20 | 43E | 120 | 40E | 3 | |
| 2 | BXO – 6 | -27 | 62W | 225 | 65W | 5 | |
| 3 | BXO – 7 | -7 | 10W | 173 | 13W | 4 | |
| 4 | BXO – 7 | -10 | 34E | 129 | 31E | 45 | |
| 5 | CKI – 15 | -27 | 61E | 102 | 58E | 35 | |
| 6 | EKC – 25 | -9 | 64E | 99 | 61E | 13 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.