Daily Sunspot Evaluation
Observation Sheet Thursday, 13 July 1972
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)
- 11
- Number of spots (f)
- 26
- Relative number (R)
- 136
- Observer
- ED
- Reading
- all checks consistent
- File
- 19720713.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 9 | 64E | 243 | |||
| 2 | ? – 2 | -9 | 84E | 223 | |||
| 3 | J – 2 | -11 | 68E | 239 | |||
| 4 | J – 1 | -12 | 12E | 295 | |||
| 5 | B – 2 | -9 | 19W | 326 | |||
| 6 | A – 1 | -15 | 39W | 346 | |||
| 7 | B – 7 | -10 | 48W | 355 | |||
| 8 | A – 1 | -2 | 80W | 27 | |||
| 9 | J – 2 | 8 | 70W | 17 | |||
| 10 | H – 6 | 11 | 59W | 6 | |||
| 11 | A – 1 | 12 | 33W | 340 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.