Daily Sunspot Evaluation
Observation Sheet Friday, 25 September 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)
- 9
- Number of spots (f)
- 39
- Relative number (R)
- 129
- Observer
- GT
- Reading
- all checks consistent
- File
- 19810925.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | GSI – 8 | 11 | 35W | 258 | 36W | 4.5 | |
| 2 | AXX – 1 | 8 | 66E | 157 | 65E | - | |
| 3 | HSX – 1 | -9 | 31W | 254 | 32W | 2.5 | |
| 4 | CAI – 16 | -8 | 08W | 231 | 09W | 4.5 | |
| 5 | HSX – 1 | -10 | 25E | 198 | 24E | 1.5 | |
| 6 | AXX – 1 | -10 | 31E | 192 | 30E | - | |
| 7 | CAO – 5 | -7 | 37E | 186 | 36E | 6.5 | |
| 8 | HSX – 1 | -15 | 37E | 186 | 36E | 2 | |
| 9 | DAO – 5 | -15 | 53E | 170 | 52E | 8 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.