Daily Sunspot Evaluation
Observation Sheet Monday, 31 May 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)
- 17
- Relative number (R)
- 67
- Observer
- FA
- Reading
- all checks consistent
- File
- 19710531.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 4 | 14 | 34E | 273 | |||
| 2 | J – 1 | 9 | 40E | 267 | |||
| 3 | ? – 2 | -7 | 79W | 26 | |||
| 4 | G – 7 | 11 | 29W | 336 | |||
| 5 | C – 3 | 10 | 21W | 328 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.