Daily Sunspot Evaluation
Observation Sheet Friday, 21 August 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)
- 13
- Number of spots (f)
- 88
- Relative number (R)
- 218
- Observer
- FA
- Reading
- all checks consistent
- File
- 19700821.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 12 | 21 | 07E | 73 | |||
| 2 | D – 15 | 19 | 40E | 40 | |||
| 3 | C – 7 | 13 | 28E | 52 | |||
| 4 | ? – 1 | 11 | 87E | 353 | |||
| 5 | J – 1 | 5 | 52E | 28 | |||
| 6 | A – 3 | -2 | 25E | 55 | |||
| 7 | A – 7 | -7 | 28E | 52 | |||
| 8 | C – 11 | -5 | 02W | 82 | |||
| 9 | A – 1 | -23 | 49W | 129 | |||
| 10 | H – 4 | -17 | 72W | 152 | |||
| 11 | G – 2 | -15 | 78W | 158 | |||
| 12 | H – 23 | 8 | 12W | 92 | |||
| 13 | A – 1 | 14 | 35W | 115 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.