Daily Sunspot Evaluation
Observation Sheet Monday, 18 June 1951
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)
- 6
- Number of spots (f)
- 104
- Relative number (R)
- 164
- Observer
- ET
- Reading
- all checks consistent
- File
- 19510618.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 15 | 0.26 | 21 | |
| 2 | H – 6 | 0.84 | 64 | |
| 3 | ? – 1 | 0.98 | 103 | |
| 4 | F – 78 | 0.24 | 164 | |
| 5 | J – 2 | 0.92 | 268 | |
| 6 | ? – 2 | 0.98 | 276 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.