Daily Sunspot Evaluation
Observation Sheet Thursday, 17 August 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)
- 5
- Number of spots (f)
- 38
- Relative number (R)
- 88
- Observer
- ED
- Reading
- all checks consistent
- File
- 19720817.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 19 | 60E | 145 | |||
| 2 | A – 3 | 7 | 50E | 155 | |||
| 3 | C – 10 | -10 | 26E | 179 | |||
| 4 | C – 5 | -25 | 40E | 165 | |||
| 5 | C – 19 | 16 | 36W | 241 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.