Daily Sunspot Evaluation
Observation Sheet Monday, 16 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)
- 8
- Number of spots (f)
- 43
- Relative number (R)
- 123
- Observer
- TÖ0
- Reading
- all checks consistent
- File
- 19910916.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 2 | 9 | 20E | 359 | 20E | — | 515 |
| 2 | HS – 1 | 3 | 21E | 358 | 21E | 2 | 502 |
| 3 | CAI – 19 | 7 | 38E | 341 | 38E | 8 | 505 |
| 4 | HA – 1 | -24 | 78W | 97 | 78W | 2 | 442 |
| 5 | BXO – 6 | -20 | 29W | 48 | 29W | 5 | 499 |
| 6 | CAI – 12 | -21 | 11W | 30 | 11W | 5 | 500 |
| 7 | HS – 1 | -10 | 06E | 13 | 06E | 2 | 501 |
| 8 | AX – 1 | -25 | 16E | 3 | 16E | — | 516 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.