Daily Sunspot Evaluation
Observation Sheet Saturday, 20 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)
- 12
- Number of spots (f)
- 70
- Relative number (R)
- 190
- Observer
- TA
- Reading
- all checks consistent
- File
- 19901020.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 3 | 16 | 84W | 154 | 86W | 9 | 469 |
| 2 | HK – 1 | 10 | 82W | 152 | 84W | 5 | 470 |
| 3 | HA – 1 | 5 | 30E | 40 | 28E | 1 | 488 |
| 4 | FKI – 20 | 18 | 39E | 31 | 37E | 20 | 486 |
| 5 | DAO – 5 | 16 | 57E | 13 | 55E | 7 | 491 |
| 6 | AX – 1 | 24 | 74E | 355 | 73E | 1 | 695 |
| 7 | HK – 2 | -19 | 76W | 146 | 78W | 4 | 474 |
| 8 | AR – 1 | -14 | 74W | 144 | 76W | 1 | 473 |
| 9 | AX – 2 | -28 | 29W | 99 | 31W | 2 | 479 |
| 10 | EAI – 32 | -8 | 23W | 93 | 25W | 15 | 480 |
| 11 | HS – 1 | -25 | 26E | 44 | 24E | 1.5 | 487 |
| 12 | HA – 1 | -6 | 73E | 357 | 71E | 2 | 068 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.