Daily Sunspot Evaluation
Observation Sheet Wednesday, 21 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)
- 10
- Number of spots (f)
- 107
- Relative number (R)
- 207
- Observer
- HM
- Reading
- counts consistent, some coordinates doubtful
- File
- 19811021.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HAX – 1 | 19 | 06W | 327 ⚠ | 87W | 5 | |
| 2 | CAI – 7 | 18 | 04W | 247 | 07W | 7 | |
| 3 | AXX – 1 | 104 | 44E | 199 | 41E | - | |
| 4 | CAI – 4 | 15 | 79E | 164 | 76E | 10 | |
| 5 | FKC – 6 | -19 | 75W | 318 | 78W | 9 | |
| 6 | FKC – 49 | -11 | 81W | 274 ⚠ | 34W | 16 | |
| 7 | DKC – 31 | -8 | 06W | 249 | 09W | 9 | |
| 8 | AXX – 1 | -10 | 02E | 241 | 01W | - | |
| 9 | CAI – 6 | -28 | 59E | 184 | 56E | 5 | |
| 10 | ? – 1 | -31 | 75E | 168 | 72E | 2 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.