Daily Sunspot Evaluation
Observation Sheet Wednesday, 17 February 1971
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)
- 6
- Number of spots (f)
- 36
- Relative number (R)
- 96
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710217.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | G – 13 | 17 | 06E | 219 | |||
| 2 | J – 8 | -13 | 39E | 186 | |||
| 3 | ? – 4 | -16 | 82E | 143 | |||
| 4 | A – 1 | -15 | 44E | 181 | |||
| 5 | J – 1 | -13 | 24E | 201 | |||
| 6 | G – 9 | 14 | 44W | 269 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.