Daily Sunspot Evaluation
Observation Sheet Friday, 18 September 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)
- 7
- Number of spots (f)
- 50
- Relative number (R)
- 120
- Observer
- FA
- Reading
- all checks consistent
- File
- 19700918.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 21 | 19 | 52'E | 19 | |||
| 2 | J – 2 | 4 | 43'E | 28 | |||
| 3 | D – 8 | -16 | 34'E | 37 | |||
| 4 | J – 1 | -23 | 17'W | 88 | |||
| 5 | A – 2 | -15 | 25'W | 36 | |||
| 6 | J – 1 | -12 | 56'W | 121 | |||
| 7 | C – 15 | 12 | 34'W | 105 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.