Daily Sunspot Evaluation
Observation Sheet Thursday, 9 December 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)
- 9
- Number of spots (f)
- 53
- Relative number (R)
- 143
- Observer
- FA
- Reading
- counts consistent, some coordinates doubtful
- File
- 19711209.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 9 | 6 | 04E | 287 | |||
| 2 | C – 10 | 9 | 48E | 243 | |||
| 3 | J – 2 | -3 | 40E | 251 | |||
| 4 | A – 4 | -6 | 04E | 287 | |||
| 5 | J – 2 | -13 | 13W | 304 | |||
| 6 | E – 15 | -5 | 31W | 322 | |||
| 7 | A – 1 | 10 | 60W | 251 ⚠ | |||
| 8 | B – 8 | 11 | 20W | 311 | |||
| 9 | B – 2 | 21 | 29W | 320 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.