Daily Sunspot Evaluation
Observation Sheet Friday, 19 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)
- 7
- Number of spots (f)
- 38
- Relative number (R)
- 108
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710219.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 1 | -7 | 75E | 126 | |||
| 2 | E – 23 | -18 | 60E | 141 | |||
| 3 | D – 9 | -14 | 15E | 186 | |||
| 4 | J – 1 | -14 | 01W | 202 | |||
| 5 | A – 1 | -11 | 42W | 243 | |||
| 6 | H – 1 | 13 | 70W | 274 | |||
| 7 | G – 2 | 18 | 17W | 218 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.