Daily Sunspot Evaluation
Observation Sheet Monday, 22 April 1991
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)
- 6
- Number of spots (f)
- 16
- Relative number (R)
- 76
- Observer
- SG0
- Reading
- all checks consistent
- File
- 19910422.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 2 | 7 | 75W | 240 | 77W | 5.5 | 159 |
| 2 | AR – 2 | 16 | 60W | 225 | 62W | 2 | 180 |
| 3 | AR – 1 | 12 | 53W | 218 | 55W | 1 | 163 |
| 4 | CAO – 4 | -15 | 53W | 218 | 55W | 3.5 | 183 |
| 5 | DAI – 6 | -11 | 25W | 190 | 27W | 4.5 | 174 |
| 6 | AX – 1 | -8 | 15W | 180 | 17W | - | 178 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.