Daily Sunspot Evaluation
Observation Sheet Thursday, 19 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)
- 27
- Relative number (R)
- 77
- Observer
- HM
- Reading
- counts consistent, some coordinates doubtful
- File
- 19740919.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | 10 | 25E | 189 | |||
| 2 | A – 1 | 7 | 15E | 209 ⚠ | |||
| 3 | B – 6 | -11 | 73W | 287 | |||
| 4 | A – 1 | -10 | 59W | 293 ⚠ | |||
| 5 | H – 17 | 9 | 54W | 268 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.