Daily Sunspot Evaluation
Observation Sheet Tuesday, 12 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)
- 12
- Number of spots (f)
- 100
- Relative number (R)
- 220
- Observer
- SG0
- Reading
- all checks consistent
- File
- 19910212.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 1 | 18 | 60W | 55 | 62W | - | 32 |
| 2 | DSI – 15 | 12 | 31W | 26 | 33W | 7.5 | 59 |
| 3 | EKC – 39 | 13 | 15W | 10 | 17W | 10.5 | 21 |
| 4 | AX – 1 | 21 | 04W | 359 | 06W | - | 63 |
| 5 | CKI – 5 | 27 | 65E | 290 | 63E | 9 | 70 |
| 6 | ? – 2 | 25 | 72E | 285 | 70E | 7 | 64 |
| 7 | ? – 1 | -11 | 73W | 68 | 75W | 1 | 57 |
| 8 | BRI – 7 | -14 | 14W | 9 | 16W | 3.5 | 71 |
| 9 | BRO – 5 | -15 | 12E | 343 | 10E | 9.5 | 60 |
| 10 | CAI – 18 | -10 | 29E | 326 | 27E | 12 | 67 |
| 11 | HA – 2 | -5 | 33E | 322 | 31E | 1.5 | 62 |
| 12 | AX – 4 | -7 | 42E | 313 | 40E | 0.5 | 63 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.