Daily Sunspot Evaluation
Observation Sheet Thursday, 28 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)
- 9
- Relative number (R)
- 69
- Observer
- WG
- Reading
- all checks consistent
- File
- 19510628.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | A – 1 | 0.76 | 73 | |
| 2 | A – 1 | 0.94 | 93 | |
| 3 | C – 2 | 0.79 | 235 | |
| 4 | A – 1 | 0.98 | 280 | |
| 5 | J – 2 | 0.26 | 301 | |
| 6 | A – 2 | 0.21 | 340 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.