Daily Sunspot Evaluation
Observation Sheet Tuesday, 13 March 1973
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)
- 47
- Relative number (R)
- 87
- Observer
- HM
- Reading
- all checks consistent
- File
- 19730313.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 12 | -7 | 01E | 340 | 45 | ||
| 2 | D – 19 | -12 | 11E | 330 | 44 | ||
| 3 | J – 2 | -18 | 36W | 17 | 41 | ||
| 4 | D – 14 | 13 | 46W | 27 | 42 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.