Daily Sunspot Evaluation
Observation Sheet Thursday, 19 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)
- 36
- Relative number (R)
- 86
- Observer
- HM
- Reading
- all checks consistent
- File
- 19710819.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 1 | 13 | 12°E | 317 | |||
| 2 | J – 1 | 17 | 36°E | 293 | |||
| 3 | F – 28 | -13 | 63°E | 266 | |||
| 4 | B – 5 | -16 | 47°W | 16 | |||
| 5 | J – 1 | 14 | 15°W | 344 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.