Daily Sunspot Evaluation
Observation Sheet Thursday, 15 October 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)
- 8
- Number of spots (f)
- 128
- Relative number (R)
- 208
- Observer
- HM
- Reading
- all checks consistent
- File
- 19811015.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAI – 8 | 20 | 57W | 18 | 60W | 8 | |
| 2 | AXX – 2 | 14 | 07W | 328 | 10W | - | |
| 3 | HSX – 3 | 19 | 07W | 328 | 10W | 4 | |
| 4 | DAI – 9 | -16 | 39W | 360 | 42W | 135 | |
| 5 | FKC – 56 | -18 | 12W | 333 | 15W | 19 | |
| 6 | DAI – 7 | -19 | 00 | 321 | 03W | 65 | 5 |
| 7 | FKC – 35 | -10 | 49E | 272 | 46E | 145 | |
| 8 | FKC – 8 | -9 | 74E | 247 | 71E | 11 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.