Daily Sunspot Evaluation
Observation Sheet Friday, 13 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)
- 119
- Relative number (R)
- 209
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19810313.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | KAX – 1 | 11 | 76W | 12 | 79W | 9466 | |
| 2 | CAO – 6 | 25 | 39W | 335 | 42W | ||
| 3 | FKC – 66 | 7 | 19W | 315 | 22W | ||
| 4 | AXX – 1 | 17 | 60E | 236 | 57E | ||
| 5 | ARX – 1 | 20 | 61E | 235 | 58E | ||
| 6 | HKX – 4 | -3 | 72W | 8 | 75W | ||
| 7 | CRO – 3 | -13 | 66W | 2 | 69W | ||
| 8 | DAI – 29 | -5 | 25E | 271 | 22E | ||
| 9 | CAO – 8 | -21 | 36E | 260 | 33E |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.