Daily Sunspot Evaluation
Observation Sheet Wednesday, 20 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)
- 17
- Number of spots (f)
- 161
- Relative number (R)
- 331
- Observer
- HÇ0
- Reading
- all checks consistent
- File
- 19910220.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 1 | 6 | 62W | 312 | 65W | - | 89 |
| 2 | HA – 2 | 23 | 36W | 286 | 39W | 1 | 30 |
| 3 | AX – 1 | 24 | 30W | 280 | 33W | 0.5 | |
| 4 | CAI – 16 | 29 | 23E | 227 | 20E | 8 | 17 |
| 5 | HA – 1 | 11 | 61E | 189 | 58E | 1 | 86 |
| 6 | ? – 3 | 16 | 78E | 172 | 75E | 10 | 31 |
| 7 | AX – 2 | -3 | 73W | 323 | 76W | 1 | 68 |
| 8 | AX – 1 | -6 | 68W | 318 | 71W | - | 92 |
| 9 | BRO – 4 | -8 | 52W | 302 | 55W | 5 | 87 |
| 10 | CKI – 27 | -13 | 13W | 263 | 16W | 5.5 | 78 |
| 11 | BXO – 8 | -18 | 07W | 257 | 10W | 3 | 76 |
| 12 | AX – 2 | -13 | 01E | 249 | 02W | 0.5 | 82 |
| 13 | DKC – 31 | -16 | 21E | 229 | 18E | 9 | |
| 14 | CAO – 4 | -5 | 27E | 223 | 24E | 7 | 83 |
| 15 | EKC – 26 | -21 | 56E | 194 | 53E | 14.5 | 84 |
| 16 | FKO – 30 | -13 | 61E | 189 | 58E | 21 | 85 |
| 17 | AX – 2 | -8 | 59E | 191 | 56E | 2 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.