Daily Sunspot Evaluation
Observation Sheet Sunday, 4 February 1990
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)
- 7
- Number of spots (f)
- 62
- Relative number (R)
- 132
- Observer
- TÖ0
- Reading
- all checks consistent
- File
- 19900204.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 2 | 6 | 71W | 310 | 74W | 1 | 60 |
| 2 | HS – 1 | 12 | 68W | 307 | 71W | 2.5 | 43 |
| 3 | DAI – 8 | 14 | 64W | 303 | 67W | 7 | 55 |
| 4 | HS – 4 | 24 | 27W | 266 | 30W | 3 | 53 |
| 5 | DAI – 23 | 14 | 14W | 253 | 17W | 8.5 | 61 |
| 6 | DAI – 22 | 7 | 10W | 249 | 13W | 8.5 | 58 |
| 7 | CAO – 2 | -15 | 74W | 313 | 77W | 5 | 50 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.