Daily Sunspot Evaluation
Observation Sheet Monday, 18 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)
- 18
- Relative number (R)
- 58
- Observer
- HM
- Reading
- all checks consistent
- File
- 19720918.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 3 | -15 | 63E | 79 | |||
| 2 | C – 7 | -9 | 22W | 164 | |||
| 3 | A – 3 | -12 | 47W | 189 | |||
| 4 | A – 5 | 14 | 32W | 174 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.