Daily Sunspot Evaluation
Observation Sheet Wednesday, 17 September 1969
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)
- 10
- Number of spots (f)
- 67
- Relative number (R)
- 167
- Observer
- SK
- Reading
- counts consistent, some coordinates doubtful
- File
- 19690917.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 2 | 11 | 72E | 149 | |||
| 2 | A – 1 | -21 | 51E | 170 | |||
| 3 | A – 3 | -19 | 39E | 182 | |||
| 4 | A – 2 | -5 | 13E | 208 | |||
| 5 | D – 21 | -5 | 05E | 220 ⚠ | |||
| 6 | H – 4 | -18 | 26W | 247 | |||
| 7 | J – 3 | -11 | 25W | 246 | |||
| 8 | J – 2 | -7 | 20W | 241 | |||
| 9 | D – 13 | 7 | 41W | 262 | |||
| 10 | D – 16 | 15 | 44W | 235 ⚠ |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.