Daily Sunspot Evaluation
Observation Sheet Tuesday, 10 April 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)
- 6
- Number of spots (f)
- 81
- Relative number (R)
- 141
- Observer
- HM
- Reading
- counts consistent, some coordinates doubtful
- File
- 19730410.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | E – 43 | -9 | 10E | 323 | 82 | ||
| 2 | A – 5 | -16 | 08W | 311 ⚠ | 64 | ||
| 3 | B – 8 | -12 | 17W | 350 | 58 | ||
| 4 | C – 21 | -9 | 26W | 353 ⚠ | 61 | ||
| 5 | A – 2 | -8 | 15W | 348 | 65 | ||
| 6 | J – 2 | 12 | 63W | 42 ⚠ | 59 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.