Daily Sunspot Evaluation
Observation Sheet Sunday, 21 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)
- 11
- Number of spots (f)
- 36
- Relative number (R)
- 146
- Observer
- YK
- Reading
- all checks consistent
- File
- 19990221.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 5 | 35 | 73W | 262 | 75W | - | |
| 2 | HA – 2 | 21 | 71W | 260 | 73W | ~2 | |
| 3 | HR – 4 | 19 | 45W | 234 | 47W | 2 | |
| 4 | BXO – 5 | 15 | 10W | 199 | 12W | 3 | |
| 5 | AX – 2 | 11 | 08W | 197 | 10W | 2 | |
| 6 | CAO – 5 | 15 | 13E | 176 | 11E | 3.5 | HA-5 |
| 7 | DHI – 5 | -23 | 77W | 266 | 79W | 5 | |
| 8 | AX – 1 | -18 | 63W | 252 | 65W | - | |
| 9 | HA – 3 | -18 | 51W | 240 | 53W | 1 | |
| 10 | AX – 1 | -19 | 07W | 196 | 09W | - | |
| 11 | AX – 3 | -23 | 05W | 194 | 07W | 1 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.