Daily Sunspot Evaluation
Observation Sheet Tuesday, 19 September 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)
- 7
- Relative number (R)
- 47
- Observer
- HM
- Reading
- all checks consistent
- File
- 19720919.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 8 | 16E | 112 | |||
| 2 | J – 3 | -15 | 48E | 79 | |||
| 3 | J – 1 | -9 | 39W | 167 | |||
| 4 | A – 2 | 13 | 44W | 172 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.