Daily Sunspot Evaluation
Observation Sheet Thursday, 19 September 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)
- 6
- Number of spots (f)
- 61
- Relative number (R)
- 121
- Observer
- MB
- Reading
- all checks consistent
- File
- 19910919.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HA – 3 | 2 | 18W | 0 | 20W | 2 | 502 |
| 2 | CAI – 35 | 9 | 03W | 345 | 05W | 12 | 503 |
| 3 | BXI – 15 | 8 | 09E | 333 | 07E | 10 | 520 |
| 4 | AX – 2 | 10 | 39E | 303 | 37E | 2.5 | 521 |
| 5 | AX – 4 | -23 | 46W | 28 | 48W | 3 | 500 |
| 6 | HA – 2 | -11 | 32W | 14 | 34W | 2 | 501 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.