Daily Sunspot Evaluation
Observation Sheet Friday, 31 March 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)
- 20
- Relative number (R)
- 70
- Observer
- HM
- Reading
- all checks consistent
- File
- 19720331.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | -6 | 35E | 208 | |||
| 2 | D – 9 | -7 | 53E | 190 | |||
| 3 | J – 2 | -8 | 40E | 203 | |||
| 4 | J – 6 | -10 | 44E | 199 | |||
| 5 | J – 2 | -27 | 06W | 249 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.