Daily Sunspot Evaluation
Observation Sheet Saturday, 18 January 1958
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)
- 22
- Number of spots (f)
- 89
- Relative number (R)
- 309
- Observer
- AB
- Reading
- all checks consistent
- File
- 19580118.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 22 | 8E | ||||
| 2 | A – 1 | 18 | 21E | ||||
| 3 | A – 1 | 30 | 41E | ||||
| 4 | H – 3 | 22 | 30E | ||||
| 5 | B – 2 | 25 | 45E | ||||
| 6 | C – 17 | 26 | 55E | ||||
| 7 | ? – 4 | 29 | 73E | ||||
| 8 | J – 1 | 21 | 62E | ||||
| 9 | A – 1 | 5 | 45E | ||||
| 10 | A – 1 | -12 | 57E | ||||
| 11 | B – 5 | -17 | 48E | ||||
| 12 | A – 2 | -20 | 65E | ||||
| 13 | A – 2 | -12 | 15W | ||||
| 14 | J – 1 | -23 | 39W | ||||
| 15 | A – 2 | -24 | 59W | ||||
| 16 | J – 2 | -20 | 68W | ||||
| 17 | ? – 2 | -14 | 83W | ||||
| 18 | C – 8 | -8 | 28W | ||||
| 19 | J – 1 | -4 | 26W | ||||
| 20 | F – 24 | 13 | 11W | ||||
| 21 | ? – 1 | 24 | 75W | ||||
| 22 | C – 7 | 29 | 40W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.