Daily Sunspot Evaluation
Observation Sheet Thursday, 18 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)
- 9
- Number of spots (f)
- 63
- Relative number (R)
- 153
- Observer
- SG0
- Reading
- counts consistent, some coordinates doubtful
- File
- 19990218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 2 | 25 | 58W | 280 ⚠ | 61W | 1 | |
| 2 | HS – 1 | 19 | 48W | 278 | 51W | 3 | |
| 3 | EKO – 11 | 13 | 46W | 276 | 49W | 15 | |
| 4 | CKS – 14 | 20 | 31W | 261 | 34W | 6 | |
| 5 | CAI – 10 | 18 | 03W | 233 | 06W | 5 | |
| 6 | HA – 3 | 15 | 53E | 171 ⚠ | 50E | 2 | |
| 7 | DAO – 6 | -30 | 73W | 303 | 76W | 10 | |
| 8 | DKC – 15 | -23 | 39W | 269 | 42W | 9 | |
| 9 | HS – 1 | -19 | 11W | 241 | 14W | 2 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.