Daily Sunspot Evaluation
Observation Sheet Saturday, 18 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)
- 5
- Number of spots (f)
- 31
- Relative number (R)
- 81
- Observer
- HA
- Reading
- counts consistent, some coordinates doubtful
- File
- 19700718.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 6 | 8 | 81E | 98 ⚠ | |||
| 2 | J – 1 | -19 | 29W | 198 ⚠ | |||
| 3 | A – 1 | 5 | 70W | 299 ⚠ | |||
| 4 | A – 8 | -17 | 60W | 229 ⚠ | |||
| 5 | C – 15 | 18 | 34W | 209 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.