Daily Sunspot Evaluation
Observation Sheet Thursday, 23 April 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)
- 8
- Number of spots (f)
- 32
- Relative number (R)
- 112
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19810423.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AXX – 1 | 23 | 65W | 180 | 68W | - | |
| 2 | AXX – 1 | 17 | 59W | 174 | 62W | - | |
| 3 | CAO – 3 | 7 | 42W | 157 | 45W | 4 | |
| 4 | HKI – 11 | 14 | 34W | 149 | 37W | 6 | |
| 5 | CZI – 11 | 24 | 29W | 144 | 32W | 7 | |
| 6 | CRO – 2 | 13 | 07E | 108 | 04E | 2 | |
| 7 | ? – 2 | -9 | 84W | 199 | 87W | - | |
| 8 | HAX – 1 | -11 | 32W | 147 | 35W | 15 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.