Daily Sunspot Evaluation
Observation Sheet Sunday, 19 September 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)
- 7
- Number of spots (f)
- 35
- Relative number (R)
- 105
- Observer
- HM
- Reading
- all checks consistent
- File
- 19710919.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | -2 | 35E | 243 | |||
| 2 | C – 5 | -9 | 10E | 268 | |||
| 3 | A – 1 | -14 | 12E | 266 | |||
| 4 | E – 25 | -12 | 02W | 280 | |||
| 5 | J – 1 | 5 | 03W | 281 | |||
| 6 | J – 1 | 12 | 41W | 319 | |||
| 7 | J – 1 | 13 | 15W | 293 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.