Daily Sunspot Evaluation
Observation Sheet Saturday, 7 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)
- 10
- Number of spots (f)
- 59
- Relative number (R)
- 159
- Observer
- OG
- Reading
- all checks consistent
- File
- 19810307.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXO – 5 | 10 | 11W | 26 | 14W | 3.5 | |
| 2 | HAX – 1 | 3 | 06W | 21 | 09W | 2 | |
| 3 | HAX – 3 | 11 | 08E | 7 | 05E | 2.5 | |
| 4 | AXX – 2 | 28 | 26E | 347 | 23E | 1 | |
| 5 | HKX – 1 | 24 | 36E | 339 | 33E | 3 | |
| 6 | ? – 9 | 9 | 70E | 305 | 67E | 15 | |
| 7 | HKX – 8 | -12 | 65W | 79 | 67W | 5 | |
| 8 | HKX – 2 | -12 | 41W | 56 | 44W | 3 | |
| 9 | HAX – 2 | -3 | 24W | 39 | 27W | 2.5 | |
| 10 | EKI – 26 | -4 | 15E | 0 | 12E | 14 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.