Daily Sunspot Evaluation
Observation Sheet Monday, 17 April 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)
- 38
- Relative number (R)
- 78
- Observer
- FA
- Reading
- counts consistent, some coordinates doubtful
- File
- 19720417.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 7 | -6 | 11E | 6 | |||
| 2 | E – 25 | -10 | 52E | 325 | |||
| 3 | B – 5 | -10 | 33W | 56 ⚠ | |||
| 4 | J – 1 | 9 | 11W | 28 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.