Daily Sunspot Evaluation
Observation Sheet Saturday, 21 March 1981
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)
- 9
- Number of spots (f)
- 62
- Relative number (R)
- 152
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19810321.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DKC – 21 | 9 | 21W | 208 | 21W | 7 | |
| 2 | AXX – 1 | 14 | 06W | 193 | 06W | ||
| 3 | AXX – 1 | 11 | 03E | 184 | 03E | ||
| 4 | CAO – 4 | 20 | 13E | 174 | 13E | 7 | |
| 5 | DBO – 11 | 12 | 21E | 166 | 21E | 12 | |
| 6 | BKO – 17 | 15 | 45E | 142 | 45E | 13.25 | |
| 7 | HAX – 2 | 20 | 64E | 123 | 64E | 1.25 | |
| 8 | CAO – 4 | -17 | 50E | 137 | 50E | 6 | |
| 9 | ? – 1 | -44 | 78E | 109 | 78E |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.