Daily Sunspot Evaluation
Observation Sheet Friday, 9 July 1971
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)
- 33
- Relative number (R)
- 83
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710709.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 2 | -12 | 58E | 92 | |||
| 2 | C – 12 | -8 | 29E | 121 | |||
| 3 | C – 16 | -7 | 21E | 129 | |||
| 4 | ? – 2 | -14 | 82W | 232 | |||
| 5 | J – 1 | 16 | 79W | 229 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.