Daily Sunspot Evaluation
Observation Sheet Tuesday, 18 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)
- 9
- Number of spots (f)
- 93
- Relative number (R)
- 183
- Observer
- FA
- Reading
- all checks consistent
- File
- 19700818.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 8 | 13 | 70°E | 50 | |||
| 2 | H – 25 | 8 | 27°E | 83 | |||
| 3 | A – 5 | -1 | 23°E | 97 | |||
| 4 | B – 12 | -10 | 09°E | 111 | |||
| 5 | E – 16 | -17 | 33°W | 153 | |||
| 6 | A – 7 | -14 | 40°W | 162 | |||
| 7 | E – 12 | -9 | 60°W | 182 | |||
| 8 | ? – 6 | 22 | 78°W | 198 | |||
| 9 | A – 2 | 21 | 11°W | 131 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.