Daily Sunspot Evaluation
Observation Sheet Tuesday, 13 July 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)
- 4
- Number of spots (f)
- 66
- Relative number (R)
- 106
- Observer
- HM
- Reading
- all checks consistent
- File
- 19710713.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | G – 7 | 16 | 40E | 58 | |||
| 2 | G – 5 | 6 | 72E | 26 | |||
| 3 | C – 10 | -11 | 05E | 93 | |||
| 4 | E – 44 | -8 | 27W | 125 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.