Daily Sunspot Evaluation
Observation Sheet Sunday, 16 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)
- 5
- Number of spots (f)
- 31
- Relative number (R)
- 81
- Observer
- HM
- Reading
- all checks consistent
- File
- 19720416.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 8 | 03E | 28 | |||
| 2 | D – 10 | -6 | 25E | 6 | |||
| 3 | D – 9 | -10 | 66E | 325 | |||
| 4 | C – 7 | -11 | 24W | 55 | |||
| 5 | J – 4 | -8 | 49W | 80 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.