Daily Sunspot Evaluation
Observation Sheet Tuesday, 21 February 1984
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)
- 4
- Number of spots (f)
- 52
- Relative number (R)
- 92
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19840221.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | FKC – 39 | 15 | 30°E | 115 | 25°E | 20.5 | 28 |
| 2 | DKC – 6 | 10 | 57E | 88 | 56E | 7.5 | 30 |
| 3 | DAO – 3 | -5 | 55W | 200 | 56W | 4 | 27 |
| 4 | AXX – 4 | -19 | 08W | 153 | 09W | 2 | 29 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.