Daily Sunspot Evaluation
Observation Sheet Thursday, 12 August 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)
- 6
- Number of spots (f)
- 49
- Relative number (R)
- 109
- Observer
- HM
- Reading
- all checks consistent
- File
- 19710812.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 15 | 20 | 19°E | 42 | |||
| 2 | C – 6 | 13 | 25°E | 36 | |||
| 3 | J – 2 | 13 | 69°E | 352 | |||
| 4 | C – 14 | -12 | 31°W | 92 | |||
| 5 | H – 5 | -8 | 38°W | 99 | |||
| 6 | C – 7 | 12 | 63°W | 124 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.