Daily Sunspot Evaluation
Observation Sheet Monday, 31 July 1972
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)
- 78
- Relative number (R)
- 168
- Observer
- FA
- Reading
- all checks consistent
- File
- 19720731.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 14 | 12 | 61E | 8 | |||
| 2 | B – 6 | -4 | 47E | 22 | |||
| 3 | A – 6 | -20 | 14E | 55 | |||
| 4 | C – 6 | -16 | 05E | 64 | |||
| 5 | E – 33 | -15 | 17W | 86 | |||
| 6 | A – 1 | -7 | 17W | 86 | |||
| 7 | J – 1 | 5 | 51W | 120 | |||
| 8 | B – 7 | 7 | 36W | 105 | |||
| 9 | G – 4 | 7 | 69W | 138 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.