Daily Sunspot Evaluation
Observation Sheet Wednesday, 17 February 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)
- 10
- Number of spots (f)
- 64
- Relative number (R)
- 164
- Observer
- SB0
- Reading
- all checks consistent
- File
- 19990217.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | FKC – 15 | 13 | 32W | 275 | 35W | ~16.5 | |
| 2 | HS – 1 | 16 | 34W | 277 | 37W | 1.5 | |
| 3 | ESC – 17 | 19 | 20W | 263 | 23W | 10.5 | |
| 4 | HS – 4 | 18 | 10E | 233 | 07E | 3 | |
| 5 | HS – 1 | 15 | 66E | 177 | 63E | ~1.5 | |
| 6 | EAC – 8 | -31 | 62W | 305 | 65W | 13 | |
| 7 | DKI – 11 | -23 | 26W | 269 | 29W | 9 | |
| 8 | CSO – 5 | -19 | 11W | 254 | 14W | 3.5 | |
| 9 | HS – 1 | -18 | 03E | 240 | 00 | 2 | |
| 10 | AX – 1 | -25 | 55E | 188 | 52E | - |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.