Daily Sunspot Evaluation
Observation Sheet Tuesday, 18 June 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)
- 12
- Number of spots (f)
- 79
- Relative number (R)
- 199
- Observer
- YK
- Reading
- all checks consistent
- File
- 19910618.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 2 | 12 | 80W | 211 | 82W | 9 | 307 |
| 2 | CSI – 23 | 8 | 41E | 90 | 39E | 8 | 302 |
| 3 | ? – 1 | 22 | 80E | 51 | 78E | 310 | |
| 4 | AX – 1 | -9 | 66W | 197 | 68W | 311 | |
| 5 | CAI – 3 | -5 | 58W | 189 | 60W | 5 | 296 |
| 6 | AX – 1 | -20 | 38W | 169 | 40W | 305 | |
| 7 | AX – 1 | -25 | 29W | 160 | 31W | 295 | |
| 8 | AX – 2 | -15 | 14W | 145 | 16W | 0.5 | 300 |
| 9 | DAC – 32 | -13 | 01W | 132 | 03W | 7.5 | 304 |
| 10 | CAI – 11 | -29 | 19E | 112 | 17E | 7 | 301 |
| 11 | AX – 1 | -15 | 47E | 84 | 45E | 305 | |
| 12 | AX – 1 | -28 | 68E | 63 | 66E | 312 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.