Daily Sunspot Evaluation
Observation Sheet Thursday, 17 December 1998
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)
- 4
- Number of spots (f)
- 24
- Relative number (R)
- 64
- Observer
- ıH
- Reading
- all checks consistent
- File
- 19981217.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HA – 1 | 23 | 05E | 334 | 22E | 2 | 233 2891 |
| 2 | ? – 1 | 17 | 83E | 256 | 80E | 5 | 236 294 |
| 3 | DSO – 4 | -18 | 59W | 38 | 62W | 10 | 231 289 |
| 4 | ESC – 18 | -28 | 42W | 21 | 45W | 14 | 232 280 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.