Daily Sunspot Evaluation
Observation Sheet Monday, 15 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)
- 5
- Number of spots (f)
- 23
- Relative number (R)
- 73
- Observer
- FA
- Reading
- all checks consistent
- File
- 19710215.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | G – 2 | 18 | 34E | 219 | |||
| 2 | J – 1 | -14 | 52E | 201 | |||
| 3 | J – 3 | -14 | 68E | 185 | |||
| 4 | A – 1 | 10 | 45W | 298 | |||
| 5 | D – 16 | 14 | 15W | 268 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.