Daily Sunspot Evaluation
Observation Sheet Sunday, 20 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)
- 9
- Number of spots (f)
- 113
- Relative number (R)
- 203
- Observer
- HM
- Reading
- all checks consistent
- File
- 19720220.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | F – 66 | 11 | 30E | 19 | |||
| 2 | G – 7 | -18 | 66E | 343 | |||
| 3 | H – 5 | -17 | 12E | 37 | |||
| 4 | H – 15 | -13 | 02E | 47 | |||
| 5 | E – 11 | -21 | 41W | 90 | |||
| 6 | J – 1 | -10 | 13W | 62 | |||
| 7 | J – 2 | -6 | 11W | 60 | |||
| 8 | G – 5 | 16 | 67W | 116 | |||
| 9 | J – 1 | 23 | 45W | 94 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.