Daily Sunspot Evaluation
Observation Sheet Wednesday, 18 September 1974
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)
- 5
- Number of spots (f)
- 31
- Relative number (R)
- 81
- Observer
- FA
- Reading
- all checks consistent
- File
- 19740918.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 3 | 9 | 44E | 183 | |||
| 2 | A – 1 | -15 | 27W | 254 | |||
| 3 | B – 3 | -10 | 43W | 270 | |||
| 4 | B – 7 | -11 | 58W | 285 | |||
| 5 | H – 17 | 9 | 39W | 266 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.