Daily Sunspot Evaluation
Observation Sheet Thursday, 12 October 1972
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)
- 4
- Number of spots (f)
- 7
- Relative number (R)
- 47
- Observer
- HM
- Reading
- all checks consistent
- File
- 19721012.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | -9 | 60E | 125 | |||
| 2 | ? – 4 | -4 | 72W | 257 | |||
| 3 | A – 1 | 10 | 74W | 259 | |||
| 4 | A – 1 | 21 | 55W | 240 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.