Daily Sunspot Evaluation
Observation Sheet Tuesday, 15 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)
- 9
- Number of spots (f)
- 168
- Relative number (R)
- 258
- Observer
- ET
- Reading
- all checks consistent
- File
- 19510515.jpg
Sunspot groups
| No | Group (class – spots) | r | p | Margin no. |
|---|---|---|---|---|
| 1 | F – 110 | 0.33 | 5 | |
| 2 | E – 18 | 0.37 | 37 | |
| 3 | C – 11 | 0.7 | 51 | |
| 4 | B – 12 | 0.34 | 56 | |
| 5 | ? – 1 | 0.38 | 83 | |
| 6 | A – 4 | 0.16 | 255 | |
| 7 | J – 2 | 0.46 | 269 | |
| 8 | B – 8 | 0.23 | 300 | |
| 9 | A – 2 | 0.43 | 307 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.