Daily Sunspot Evaluation
Observation Sheet Friday, 30 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)
- 8
- Number of spots (f)
- 37
- Relative number (R)
- 117
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710730.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 18 | 21E | 211 | |||
| 2 | G – 5 | 11 | 35E | 197 | |||
| 3 | D – 9 | 8 | 43E | 189 | |||
| 4 | C – 9 | -12 | 01E | 231 | |||
| 5 | J – 1 | -7 | 11W | 243 | |||
| 6 | D – 9 | -12 | 42W | 274 | |||
| 7 | ? – 1 | 13 | 85W | 317 | |||
| 8 | A – 2 | 27 | 64W | 296 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.