Daily Sunspot Evaluation
Observation Sheet Sunday, 20 September 1970
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)
- 12
- Number of spots (f)
- 103
- Relative number (R)
- 223
- Observer
- MÖ
- Reading
- all checks consistent
- File
- 19700920.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 48 | 20 | 24E | 20 | |||
| 2 | A – 1 | 14 | 60E | 344 | |||
| 3 | ? – 3 | 13 | 79E | 325 | |||
| 4 | D – 7 | 3 | 46E | 358 | |||
| 5 | B – 3 | 5 | 14E | 30 | |||
| 6 | A – 1 | -15 | 31E | 13 | |||
| 7 | A – 2 | -18 | 10E | 34 | |||
| 8 | B – 2 | -16 | 04E | 40 | |||
| 9 | A – 2 | -23 | 44W | 88 | |||
| 10 | C – 12 | -15 | 53W | 97 | |||
| 11 | C – 11 | 12 | 63W | 107 | |||
| 12 | C – 11 | 22 | 20W | 64 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.