Daily Sunspot Evaluation
Observation Sheet Sunday, 15 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)
- 5
- Number of spots (f)
- 9
- Relative number (R)
- 59
- Observer
- HM
- Reading
- all checks consistent
- File
- 19710815.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 2 | 14 | 28E | 354 | |||
| 2 | J – 3 | 14 | 39E | 343 | |||
| 3 | H – 2 | 13 | 65E | 317 | |||
| 4 | J – 1 | -9 | 77W | 99 | |||
| 5 | A – 1 | 13 | 21W | 43 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.