Daily Sunspot Evaluation
Observation Sheet Friday, 9 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)
- 29
- Relative number (R)
- 69
- Observer
- HM
- Reading
- all checks consistent
- File
- 19730309.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 5 | 13 | 10E | 25 | 42 | ||
| 2 | D – 16 | -7 | 55E | 340 | 45 | ||
| 3 | J – 2 | -11 | 71E | 324 | 44 | ||
| 4 | H – 6 | -17 | 17E | 18 | 41 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.