Daily Sunspot Evaluation
Observation Sheet Monday, 17 February 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)
- 48
- Relative number (R)
- 128
- Observer
- AT
- Reading
- counts consistent, some coordinates doubtful
- File
- 19690217.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 3 | 8 | 40E | 82 ⚠ | |||
| 2 | A – 3 | 10 | 52E | 90 | |||
| 3 | ? – 6 | 14 | 80E | 62 | |||
| 4 | A – 2 | -15 | 31E | 111 | |||
| 5 | C – 15 | -15 | 18E | 124 | |||
| 6 | A – 6 | -11 | 15W | 157 | |||
| 7 | A – 3 | -1 | 24W | 166 | |||
| 8 | G – 10 | 16 | 45W | 187 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.