Daily Sunspot Evaluation
Observation Sheet Wednesday, 13 February 1991
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)
- 60
- Relative number (R)
- 160
- Observer
- HÇ0
- Reading
- all checks consistent
- File
- 19910213.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CSO – 15 | 12 | 45°W | 26 | 46°W | 9° | 59 |
| 2 | DAC – 13 | 14 | 30°W | 11 | 30°W | 8° | 61 |
| 3 | CAO – 3 | 27 | 52°E | 289 | 51°E | 5° | 70 |
| 4 | HA – 1 | 24 | 55°E | 286 | 54°E | 2° | 64 |
| 5 | HA – 2 | -5 | 19°E | 322 | 18°E | 2° | 68 |
| 6 | AX – 2 | -6 | 32°E | 309 | 31°E | 0.5 | 69 |
| 7 | AX – 1 | -7 | 41°W | 22 | 42°W | 0.5 | 73 |
| 8 | CAI – 9 | -12 | 31°W | 12 | 32°W | 7.5 | 71 |
| 9 | BXO – 3 | -10 | 06°W | 347 | 07°W | 4° | 66 |
| 10 | CAI – 11 | -11 | 15°E | 326 | 14°E | 12° | 67 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.