Daily Sunspot Evaluation
Observation Sheet Tuesday, 13 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)
- 2
- Number of spots (f)
- 44
- Relative number (R)
- 64
- Observer
- GA
- Reading
- all checks consistent
- File
- 19770913.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 9 | 19 | +17°E | 207 | 47°E | ||
| 2 | F – 35 | 9 | 28E | 196 | 28E |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.