Daily Sunspot Evaluation
Observation Sheet Friday, 17 March 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)
- 8
- Number of spots (f)
- 57
- Relative number (R)
- 137
- Observer
- HM
- Reading
- all checks consistent
- File
- 19720317.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 8 | 9 | 39E | 28 | |||
| 2 | C – 10 | -6 | 14E | 53 | |||
| 3 | C – 8 | -10 | 07E | 60 | |||
| 4 | J – 4 | -19 | 24W | 91 | |||
| 5 | J – 1 | -21 | 77W | 144 | |||
| 6 | D – 23 | 7 | 23W | 90 | |||
| 7 | J – 2 | 13 | 44W | 111 | |||
| 8 | J – 1 | 16 | 52W | 119 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.