Daily Sunspot Evaluation
Observation Sheet Tuesday, 15 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)
- 4
- Number of spots (f)
- 11
- Relative number (R)
- 51
- Observer
- ED
- Reading
- all checks consistent
- File
- 19720815.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | 7 | 77E | 154 | |||
| 2 | C – 4 | -25 | 64E | 167 | |||
| 3 | A – 4 | -9 | 11W | 242 | |||
| 4 | A – 2 | 18 | 20W | 251 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.