Daily Sunspot Evaluation
Observation Sheet Sunday, 21 October 1990
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)
- 11
- Number of spots (f)
- 54
- Relative number (R)
- 164
- Observer
- TA
- Reading
- all checks consistent
- File
- 19901021.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 1 | 18 | 10W | 67 | 12W | - | 692 |
| 2 | HA – 1 | 5 | 18E | 39 | 16E | 1 | 688 |
| 3 | FAI – 19 | 19 | 27E | 30 | 25E | 20 | 696 |
| 4 | DAO – 6 | 16 | 44E | 13 | 42E | 7 | 691 |
| 5 | AX – 1 | 25 | 62E | 355 | 60E | - | 695 |
| 6 | AR – 1 | 16 | 71E | 346 | 69E | 1 | 696 |
| 7 | AX – 1 | -21 | 41W | 98 | 43W | - | 699 |
| 8 | EAI – 19 | -8 | 36W | 93 | 38W | 15 | 480 |
| 9 | HS – 1 | -26 | 15E | 42 | 13E | 2 | 487 |
| 10 | AX – 3 | -11 | 57E | 0 | 55E | 2 | 697 |
| 11 | HA – 1 | -6 | 58E | 359 | 56E | 1.5 | 694 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.