Daily Sunspot Evaluation
Observation Sheet Sunday, 13 May 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)
- 8
- Number of spots (f)
- 85
- Relative number (R)
- 165
- Observer
- WG
- Reading
- all checks consistent
- File
- 19510513.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | C – 6 | 0.2 | 0 | |
| 2 | A – 3 | 0.33 | 37 | |
| 3 | F – 58 | 0.58 | 42 | |
| 4 | J – 2 | 0.75 | 52 | |
| 5 | J – 1 | 0.95 | 55 | |
| 6 | J – 4 | 0.65 | 56 | |
| 7 | B – 8 | 0.68 | 64 | |
| 8 | A – 3 | 0.34 | 227 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.