Daily Sunspot Evaluation
Observation Sheet Sunday, 28 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)
- 8
- Number of spots (f)
- 56
- Relative number (R)
- 136
- Observer
- AT
- Reading
- all checks consistent
- File
- 19690928.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | G – 16 | 16 | 12E | 64 | |||
| 2 | ? – 3 | -17 | 69E | 7 | |||
| 3 | J – 3 | -16 | 54E | 22 | |||
| 4 | G – 5 | -13 | 18E | 58 | |||
| 5 | H – 4 | -13 | 06W | 82 | |||
| 6 | D – 6 | -9 | 25W | 101 | |||
| 7 | B – 14 | 7 | 15W | 91 | |||
| 8 | E – 5 | 7 | 78W | 154 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.