Daily Sunspot Evaluation
Observation Sheet Thursday, 7 February 2002
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)
- 79
- Relative number (R)
- 189
- Observer
- ZFB
- Reading
- all checks consistent
- File
- 20020207.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HS – 1 | 11 | 55W | 4 | 58W | 1 | |
| 2 | AX – 1 | 15 | 55W | 4 | 58W | ||
| 3 | DAO – 13 | 17 | 31W | 340 | 34W | 6.5 | |
| 4 | HA – 5 | 9 | 10E | 299 | 07E | 4 | |
| 5 | DRI – 12 | 12 | 21E | 288 | 18E | 4 | |
| 6 | BXO – 2 | 15 | 57E | 252 | 54E | ~4 | |
| 7 | ? – 17 | -16 | 70W | 19 | 73W | ~20 | |
| 8 | DAO – 6 | -6 | 14W | 323 | 17W | ~6 | |
| 9 | BXO – 4 | -28 | 12W | 321 | 15W | ~3.5 | |
| 10 | DAO – 14 | -26 | 30E | 279 | 27E | ~5 | |
| 11 | AX – 4 | -30 | 57E | 252 | 54E | 2 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.