Daily Sunspot Evaluation
Observation Sheet Monday, 12 September 1977
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)
- 3
- Number of spots (f)
- 42
- Relative number (R)
- 72
- Observer
- FA
- Reading
- all checks consistent
- File
- 19770912.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 12 | 17 | 32E | 206 | 31E | ||
| 2 | F – 29 | 9 | 43E | 195 | 42E | ||
| 3 | A – 1 | 23 | 78W | 316 | 79W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.