Daily Sunspot Evaluation
Observation Sheet Tuesday, 17 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)
- 6
- Number of spots (f)
- 34
- Relative number (R)
- 94
- Observer
- SM
- Reading
- all checks consistent
- File
- 19810317.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | FKC – 10 | 9 | 76W | 320 | 79W | 20 | |
| 2 | HKI – 9 | 9 | 37E | 207 | 34E | 4 | |
| 3 | CAO – 3 | 15 | 55E | 189 | 52E | 4 | |
| 4 | CAO – 3 | 20 | 69E | 175 | 66E | 9 | |
| 5 | BXO – 5 | -15 | 41W | 285 | 44W | 6 | |
| 6 | BXO – 4 | -4 | 30W | 274 | 33W | 45 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.