Daily Sunspot Evaluation
Observation Sheet Friday, 17 December 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)
- 6
- Number of spots (f)
- 53
- Relative number (R)
- 113
- Observer
- HE
- Reading
- all checks consistent
- File
- 19991217.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 2 | 19 | 17W | 219 | 20W | 2 | |
| 2 | HR – 1 | 11 | 28E | 174 | 19E | ||
| 3 | ? – 1 | 18 | 82E | 120 | 79E | ||
| 4 | DAO – 6 | -32 | 32W | 234 | 35W | 7 | |
| 5 | FKC – 42 | -11 | 27E | 175 | 24E | 17.5 | |
| 6 | HH – 1 | -17 | 77E | 125 | 74E | 3 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.