Daily Sunspot Evaluation
Observation Sheet Sunday, 13 August 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)
- 7
- Number of spots (f)
- 26
- Relative number (R)
- 96
- Observer
- HM
- Reading
- all checks consistent
- File
- 19720813.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | 18 | 07E | 250 | |||
| 2 | A – 1 | 16 | 17E | 240 | |||
| 3 | B – 11 | 14 | 46E | 211 | |||
| 4 | J – 7 | -10 | 18E | 239 | |||
| 5 | B – 2 | -17 | 48W | 305 | |||
| 6 | A – 1 | 6 | 52W | 309 | |||
| 7 | ? – 2 | 17 | 82W | 339 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.