Daily Sunspot Evaluation
Observation Sheet Wednesday, 13 May 1970
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)
- 57
- Relative number (R)
- 147
- Observer
- SK
- Reading
- all checks consistent
- File
- 19700513.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 9 | 03E | 320 | |||
| 2 | G – 8 | 20 | 26E | 297 | |||
| 3 | F – 7 | 17 | 69E | 254 | |||
| 4 | A – 4 | 2 | 34E | 289 | |||
| 5 | J – 2 | -8 | 42E | 281 | |||
| 6 | J – 1 | -11 | 49E | 274 | |||
| 7 | E – 20 | -9 | 19E | 304 | |||
| 8 | A – 1 | -16 | 67E | 256 | |||
| 9 | G – 13 | 16 | 47W | 10 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.