Daily Sunspot Evaluation
Observation Sheet Saturday, 18 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)
- 10
- Number of spots (f)
- 39
- Relative number (R)
- 139
- Observer
- ED
- Reading
- all checks consistent
- File
- 19720318.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 13 | 09E | 45 | |||
| 2 | H – 11 | 9 | 25E | 29 | |||
| 3 | C – 8 | -19 | 38E | 16 | |||
| 4 | C – 7 | -10 | 07W | 61 | |||
| 5 | A – 1 | -19 | 36W | 90 | |||
| 6 | J – 3 | 4 | 40W | 94 | |||
| 7 | J – 1 | 14 | 57W | 111 | |||
| 8 | J – 1 | 16 | 64W | 118 | |||
| 9 | A – 5 | 10 | 32W | 86 | |||
| 10 | J – 1 | -5 | 03W | 57 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.