Daily Sunspot Evaluation
Observation Sheet Thursday, 17 June 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)
- 6
- Number of spots (f)
- 19
- Relative number (R)
- 79
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710617.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 2 | -4 | 64E | 18 | |||
| 2 | A – 1 | -8 | 46E | 36 | |||
| 3 | A – 3 | -6 | 06E | 76 | |||
| 4 | A – 1 | -12 | 02E | 80 | |||
| 5 | B – 8 | -14 | 43W | 125 | |||
| 6 | J – 4 | 12 | 44W | 126 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.