Daily Sunspot Evaluation
Observation Sheet Monday, 31 December 1990
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)
- 13
- Number of spots (f)
- 104
- Relative number (R)
- 234
- Observer
- YK
- Reading
- all checks consistent
- File
- 19901231.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HA – 3 | 8 | 50E | 151 | 48E | 2.5 | 508 |
| 2 | DAC – 10 | -20 | 58W | 259 | 60W | 10 | 511 |
| 3 | HA – 2 | -24 | 58W | 259 | 60W | 2 | 512 |
| 4 | DAO – 27 | -11 | 52W | 253 | 54W | 13.5 | 515 |
| 5 | HK – 5 | -20 | 40W | 241 | 42W | 5 | 513 |
| 6 | AX – 1 | -29 | 36W | 237 | 38W | - | 510 |
| 7 | AX – 1 | -17 | 16W | 217 | 18W | - | 511 |
| 8 | BXO – 2 | -25 | 15W | 216 | 17W | 3 | 512 |
| 9 | HS – 2 | -11 | 16E | 185 | 14E | 3 | 518 |
| 10 | BXI – 39 | -24 | 18E | 183 | 16E | 19.5 | 513 |
| 11 | AX – 2 | -14 | 21E | 180 | 19E | 2 | 514 |
| 12 | AX – 1 | -17 | 24E | 177 | 22E | - | 515 |
| 13 | BXI – 9 | -10 | 37E | 164 | 35E | 7 | 516 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.