Daily Sunspot Evaluation
Observation Sheet Sunday, 18 September 1988
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)
- 10
- Number of spots (f)
- 90
- Relative number (R)
- 190
- Observer
- HÇ
- Reading
- all checks consistent
- File
- 19880918.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EAI – 28 | 30 | 55W | 102 | 56W | 14 | 243 |
| 2 | BAO – 3 | 33 | 05E | 42 | 04E | 2.7 | 229 |
| 3 | BXI – 20 | 20 | 16E | 31 | 15E | 5.2 | 231 |
| 4 | AX – 1 | -30 | 60W | 107 | 59E | 233 | |
| 5 | AX – 3 | -18 | 18W | 65 | 19W | 1.25 | 234 |
| 6 | CHI – 17 | -11 | 14W | 61 | 15W | 8 | 223 |
| 7 | DSO – 7 | -15 | 53E | 354 | 52E | 7 | 230 |
| 8 | HA – 4 | -36 | 61E | 346 | 60E | 2.5 | 232 |
| 9 | AX – 3 | -19 | 62E | 345 | 61E | 3 | 235 |
| 10 | ? – 4 | -35 | 72E | 335 | 71E | 5 | 296 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.