Daily Sunspot Evaluation
Observation Sheet Wednesday, 13 February 1974
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)
- 4
- Number of spots (f)
- 12
- Relative number (R)
- 52
- Observer
- ED
- Reading
- all checks consistent
- File
- 19740213.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | -18 | 73E | 138 | |||
| 2 | G – 4 | -18 | 09E | 202 | |||
| 3 | B – 5 | -9 | 02W | 213 | |||
| 4 | A – 2 | -12 | 18W | 229 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.