Daily Sunspot Evaluation
Observation Sheet Sunday, 18 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)
- 50
- Relative number (R)
- 80
- Observer
- GT
- Reading
- all checks consistent
- File
- 19770918.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | 26 | 49E | 112 | 46E | ||
| 2 | F – 41 | 7 | 36W | 197 | 39W | ||
| 3 | G – 7 | 16 | 45W | 206 | 48W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.