Daily Sunspot Evaluation
Observation Sheet Tuesday, 15 September 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)
- 11
- Number of spots (f)
- 103
- Relative number (R)
- 213
- Observer
- GT
- Reading
- all checks consistent
- File
- 19810915.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EK – 27 | 9 | 63W | 61 | 66W | 15 | |
| 2 | AXX – 3 | 16 | 59W | 56 | 61W | 1 | |
| 3 | OKC – 23 | 15 | 15E | 343 | 12E | 8 | |
| 4 | OKT – 23 | 19 | 20E | 338 | 17E | 10 | |
| 5 | HAX – 2 | 9 | 67E | 291 | 64E | 2 | |
| 6 | AXX – 3 | -13 | 07W | 5 | 10W | 2 | |
| 7 | BXO – 4 | -18 | 05W | 3 | 08W | 7 | |
| 8 | BXO – 5 | -18 | 36E | 322 | 38E | 3.5 | |
| 9 | AXX – 2 | -5 | 43E | 315 | 40E | 0.5 | |
| 10 | BXO – 6 | -16 | 47E | 311 | 44E | 5.5 | |
| 11 | ? – 5 | -8 | 73E | 285 | 70E | 6 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.