Daily Sunspot Evaluation
Observation Sheet Thursday, 13 August 1970
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)
- 88
- Relative number (R)
- 128
- Observer
- MA
- Reading
- all checks consistent
- File
- 19700813.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 2 | -11 | 74E | 112 | |||
| 2 | A – 2 | -7 | 64W | 250 | |||
| 3 | E – 33 | 17 | 51W | 237 | |||
| 4 | E – 51 | 21 | 15W | 201 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.