Daily Sunspot Evaluation
Observation Sheet Thursday, 23 May 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)
- 9
- Number of spots (f)
- 51
- Relative number (R)
- 141
- Observer
- YK
- Reading
- all checks consistent
- File
- 19910523.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAO – 11 | 17 | 28W | 142 | 29W | 12 | 234 |
| 2 | AX – 2 | 7 | 15E | 101 | 12E | 1.5 | 242 |
| 3 | AX – 2 | 17 | 15E | 99 | 14E | 1 | 243 |
| 4 | AX – 3 | 5 | 25E | 89 | 24E | 3 | 244 |
| 5 | EKC – 7 | 19 | 63E | 51 | 62E | 11 | 245 |
| 6 | EAI – 4 | -13 | 33W | 147 | 34W | 13.5 | 232 |
| 7 | BXI – 17 | -14 | 20W | 134 | 21W | 4.5 | 246 |
| 8 | AX – 3 | -29 | 13E | 101 | 12E | 1 | 238 |
| 9 | AX – 2 | -25 | 30E | 84 | 29E | 1 | 239 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.