Daily Sunspot Evaluation
Observation Sheet Monday, 17 January 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)
- 3
- Number of spots (f)
- 27
- Relative number (R)
- 57
- Observer
- FA
- Reading
- all checks consistent
- File
- 19720117.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 5 | 15 | 30E | 106 | |||
| 2 | E – 20 | -15 | 42E | 94 | |||
| 3 | B – 2 | -14 | 24E | 112 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.