Daily Sunspot Evaluation
Observation Sheet Sunday, 17 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)
- 70
- Relative number (R)
- 130
- Observer
- MH
- Reading
- all checks consistent
- File
- 19510617.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | B – 4 | 0.43 | 42 | |
| 2 | ? – 3 | 0.94 | 65 | |
| 3 | F – 59 | 0.33 | 128 | |
| 4 | ? – 1 | 0.97 | 268 | |
| 5 | J – 2 | 0.83 | 269 | |
| 6 | ? – 1 | 0.95 | 275 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.