Daily Sunspot Evaluation
Observation Sheet Tuesday, 15 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)
- 11
- Number of spots (f)
- 64
- Relative number (R)
- 174
- Observer
- FA
- Reading
- all checks consistent
- File
- 19700915.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 12 | 12 | 04E | 106 | |||
| 2 | A – 1 | 9 | 10E | 100 | |||
| 3 | ? – 1 | 4 | 80E | 30 | |||
| 4 | D – 4 | -17 | 75E | 35 | |||
| 5 | A – 3 | -6 | 22E | 88 | |||
| 6 | D – 13 | -22 | 25E | 85 | |||
| 7 | B – 10 | -10 | 08E | 102 | |||
| 8 | C – 13 | -10 | 06W | 116 | |||
| 9 | A – 1 | -16 | 44W | 154 | |||
| 10 | G – 4 | -11 | 69W | 179 | |||
| 11 | J – 2 | 10 | 83W | 193 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.