Daily Sunspot Evaluation
Observation Sheet Saturday, 18 September 1999
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)
- 63
- Relative number (R)
- 153
- Observer
- TA
- Reading
- all checks consistent
- File
- 19990918.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 7 | 15 | 78W | 27 | 81W | - | |
| 2 | HA – 1 | 12 | 60W | 9 | 63W | 1 | |
| 3 | DSO – 6 | 22 | 55W | 4 | 58W | 10.5 | E50-6 |
| 4 | CAO – 4 | 21 | 21W | 330 | 24W | ~4 | |
| 5 | AX – 1 | 11 | 07E | 302 | 04E | - | |
| 6 | DRI – 34 | 12 | 17E | 292 | 14E | 7 | |
| 7 | CKO – 3 | -26 | 57W | 6 | 60W | 13 | |
| 8 | AX – 4 | -12 | 38E | 271 | 35E | ~2.5 | |
| 9 | DSO – 3 | -21 | 63(E) | 246 | 60(E) | 12 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.