Daily Sunspot Evaluation
Observation Sheet Friday, 18 May 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)
- 8
- Number of spots (f)
- 156
- Relative number (R)
- 236
- Observer
- HÇ0
- Reading
- all checks consistent
- File
- 19900518.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CSO – 10 | 23 | 31W | 350 | 33W | 10 | 198 |
| 2 | BXI – 6 | 28 | 12W | 331 | 14W | 11 | 201 |
| 3 | EKI – 35 | 35 | 00 | 319 | 02E | 12 | 202 |
| 4 | AX – 3 | 8 | 57E | 262 | 55E | 1 | 207 |
| 5 | AX – 2 | -16 | 71W | 30 | 73W | 3 | 208 |
| 6 | FKC – 96 | -16 | 09E | 310 | 07E | 16 | 205 |
| 7 | AX – 1 | -10 | 67E | 252 | 65E | - | 209 |
| 8 | ? – 3 | -20 | 75E | 244 | 73E | 8 | 210 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.