Daily Sunspot Evaluation
Observation Sheet Friday, 11 February 1972
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)
- 4
- Number of spots (f)
- 20
- Relative number (R)
- 60
- Observer
- HM
- Reading
- all checks consistent
- File
- 19720211.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 16 | 44E | 124 | |||
| 2 | J – 1 | 25 | 75E | 93 | |||
| 3 | C – 14 | -8 | 25E | 143 | |||
| 4 | H – 4 | -17 | 73E | 95 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.