Daily Sunspot Evaluation
Observation Sheet Tuesday, 11 September 1973
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)
- 35
- Relative number (R)
- 65
- Observer
- HM
- Reading
- all checks consistent
- File
- 19730911.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 21 | -12 | 40W | 137 | 165 | ||
| 2 | D – 13 | -10 | 56W | 153 | 168 | ||
| 3 | H – 1 | 13 | 68W | 165 | 159 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.