Daily Sunspot Evaluation
Observation Sheet Friday, 31 July 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)
- 61
- Relative number (R)
- 141
- Observer
- MA
- Reading
- all checks consistent
- File
- 19700731.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 14 | 62E | 296 | |||
| 2 | J – 1 | -8 | 26E | 332 | |||
| 3 | C – 20 | -7 | 0 | 358 | |||
| 4 | C – 6 | -12 | 47W | 45 | |||
| 5 | E – 23 | 6 | 27W | 25 | |||
| 6 | A – 3 | 15 | 51W | 49 | |||
| 7 | J – 4 | 18 | 48W | 47 | |||
| 8 | H – 3 | 25 | 44W | 42 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.