Daily Sunspot Evaluation
Observation Sheet Tuesday, 20 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)
- 9
- Number of spots (f)
- 151
- Relative number (R)
- 241
- Observer
- GT
- Reading
- counts consistent, some coordinates doubtful
- File
- 19811020.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HAX – 1 | 19 | 7W | 327 ⚠ | 7W | 2 | |
| 2 | CAI – 10 | 17 | 09E | 247 | 06E | 7 | |
| 3 | AXX – 2 | 3 | 57E | 199 | 54E | 1 | |
| 4 | FKC – 28 | -17 | 76W | 332 | 79W | 30 | |
| 5 | AXX – 3 | -41 | 21W | 277 | 24W | 3 | |
| 6 | FKC – 75 | -9 | 17W | 273 | 20W | 16 | |
| 7 | EKC – 24 | -9 | 07E | 249 | 04E | 10 | |
| 8 | CRO – 6 | -11 | 18E | 238 | 15E | 7 | |
| 9 | AXX – 2 | -8 | 55E | 201 | 52E | 0.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.