Daily Sunspot Evaluation
Observation Sheet Monday, 11 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)
- 86
- Relative number (R)
- 186
- Observer
- TA
- Reading
- all checks consistent
- File
- 19910211.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CSO – 13 | 12 | 20W | 26 | 20W | 6.5 | 59 |
| 2 | DKC – 46 | 13 | 05W | 11 | 05W | 10 | 62 |
| 3 | AR – 1 | 21 | 07E | 359 | 07E | 0.5 | 63 |
| 4 | ? – 1 | 24 | 80E | 286 | 80E | 4 | 64 |
| 5 | HA – 1 | -11 | 64W | 70 | 64W | 1.5 | 57 |
| 6 | AR – 1 | -21 | 02E | 4 | 02E | 0.5 | 65 |
| 7 | DAO – 5 | -15 | 23E | 343 | 23E | 9 | 66 |
| 8 | CAI – 15 | -11 | 39E | 327 | 39E | 11.5 | 67 |
| 9 | HA – 1 | -5 | 44E | 322 | 44E | 1.5 | 68 |
| 10 | HA – 2 | -8 | 52E | 314 | 52E | 1.5 | 69 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.