Daily Sunspot Evaluation
Observation Sheet Thursday, 16 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)
- 10
- Number of spots (f)
- 125
- Relative number (R)
- 225
- Observer
- AÖ0
- Reading
- counts consistent, some coordinates doubtful
- File
- 19810716.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ARK – 4 | 20 | 36W | 120 | 39W | 2 | |
| 2 | DAI – 19 | 22 | 25W | 109 | 28W | 85 | |
| 3 | BXO – 5 | 8 | 18E | 71 ⚠ | 10E | 55 | |
| 4 | DAI – 6 | 15 | 35E | 49 | 32E | 6 | |
| 5 | HAX – 1 | 15 | 67E | 17 | 64E | 2 | |
| 6 | HKX – 1 | 10 | 77E | 7 | 74E | 3 | |
| 7 | FKC – 59 | -9 | 19W | 103 | 22W | 20 | |
| 8 | HKC – 11 | -28 | 18W | 102 | 21W | 5 | |
| 9 | CKI – 17 | -12 | 36E | 48 | 33E | 8 | |
| 10 | ARK – 2 | -20 | 47E | 37 | 44E | 2 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.