Daily Sunspot Evaluation
Observation Sheet Tuesday, 1 January 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)
- 61
- Relative number (R)
- 181
- Observer
- TA
- Reading
- all checks consistent
- File
- 19910101.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 2 | 1 | 43W | 230 | 44W | 2.5 | 1 |
| 2 | AX – 2 | 15 | 23W | 210 | 24W | 2 | 2 |
| 3 | HA – 4 | 8 | 37E | 150 | 36E | 4 | 3 |
| 4 | ? – 2 | -20 | 72W | 259 | 73W | 7 | 4 |
| 5 | HA – 1 | -23 | 72W | 257 | 73W | 2 | 5 |
| 6 | CAI – 5 | -10 | 68W | 255 | 69W | 9 | 6 |
| 7 | HA – 7 | -19 | 55W | 242 | 56W | 4 | 7 |
| 8 | AR – 1 | -28 | 51W | 238 | 52W | 0.5 | 8 |
| 9 | CSO – 4 | -11 | 01E | 186 | 00 | 6 | 9 |
| 10 | BXI – 15 | -24 | 04E | 183 | 03E | 12 | 10 |
| 11 | AX – 1 | -13 | 07E | 180 | 06E | - | 11 |
| 12 | CAI – 17 | -10 | 21E | 166 | 20E | 7 | 12 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.