Daily Sunspot Evaluation
Observation Sheet Thursday, 15 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)
- 7
- Number of spots (f)
- 50
- Relative number (R)
- 120
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710715.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | G – 12 | 14 | 12E | 60 | |||
| 2 | J – 2 | 10 | 60E | 12 | |||
| 3 | E – 25 | 5 | 44E | 28 | |||
| 4 | A – 3 | -6 | 68E | 4 | |||
| 5 | A – 1 | -10 | 42E | 30 | |||
| 6 | H – 3 | -8 | 54W | 126 | |||
| 7 | A – 4 | 27 | 07W | 79 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.