Daily Sunspot Evaluation
Observation Sheet Thursday, 12 February 1970
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)
- 111
- Relative number (R)
- 191
- Observer
- TY
- Reading
- all checks consistent
- File
- 19700212.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 8 | -12 | 67E | 2 | |||
| 2 | A – 1 | -12 | 41E | 28 | |||
| 3 | ? – 1 | -23 | 87E | 342 | |||
| 4 | J – 2 | -21 | 03E | 66 | |||
| 5 | E – 34 | -14 | 01W | 70 | |||
| 6 | A – 3 | -12 | 11W | 80 | |||
| 7 | ? – 1 | -11 | 77W | 146 | |||
| 8 | F – 61 | 18 | 21W | 90 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.