Daily Sunspot Evaluation
Observation Sheet Wednesday, 21 October 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)
- 8
- Number of spots (f)
- 41
- Relative number (R)
- 121
- Observer
- MA
- Reading
- all checks consistent
- File
- 19701021.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 15 | 11 | 10E | 345 | |||
| 2 | J – 2 | 13 | 25E | 330 | |||
| 3 | H – 5 | 14 | 55E | 300 | |||
| 4 | A – 1 | 8 | 17E | 338 | |||
| 5 | J – 1 | -6 | 71E | 284 | |||
| 6 | D – 13 | 9 | 39W | 34 | |||
| 7 | C – 3 | 10 | 55W | 50 | |||
| 8 | J – 1 | 17 | 37W | 32 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.