Daily Sunspot Evaluation
Observation Sheet Saturday, 18 April 1992
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)
- 69
- Relative number (R)
- 149
- Observer
- NA
- Reading
- counts consistent, some coordinates doubtful
- File
- 19920418.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HA – 1 | 7 | 25W | 9 ⚠ | 32W | 2° | 162 |
| 2 | HA – 1 | -15 | 35W | 153 ⚠ | 89W | - | 156 |
| 3 | HS – 1 | -15 | 42W | 110 | 45W | 3° | 158 |
| 4 | DSI – 15 | -19 | 18W | 83 | 21W | 8 | 165 |
| 5 | AX – 1 | -20 | 21W | 85 | 24W | - | 190 |
| 6 | FAC – 31 | -27 | 26E | 42 | 23E | 16 | 161 |
| 7 | DAO – 17 | -15 | 16E | 2 ⚠ | 63E | 8 | 167 |
| 8 | ? – 2 | -17 | 83E | 345 | 80E | - | 169 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.