Daily Sunspot Evaluation
Observation Sheet Sunday, 4 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)
- 12
- Number of spots (f)
- 105
- Relative number (R)
- 225
- Observer
- OG
- Reading
- counts consistent, some coordinates doubtful
- File
- 19811004.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HAX – 3 | 8 | 54W | 161 | 53W | 2 | |
| 2 | HAX – 1 | 16 | 39W | 146 | 42W | 1 | |
| 3 | BXO – 4 | 15 | 23W | 134 ⚠ | 30W | 6 | |
| 4 | CKI – 15 | 12 | 09W | 116 | 12W | 7 | |
| 5 | DKI – 18 | 10 | 40E | 67 | 37E | 6.5 | |
| 6 | HAX – 2 | -6 | 50W | 157 | 53W | 2 | |
| 7 | AXX – 3 | -16 | 36W | 143 | 39W | 15 | |
| 8 | HAX – 1 | -17 | 19W | 126 | 22W | 2 | |
| 9 | CAI – 23 | -18 | 00 | 107 | 03W | 4 | |
| 10 | AXX – 3 | -27 | 10E | 97 | 07E | 0.5 | |
| 11 | CAI – 21 | -7 | 13E | 94 | 10E | 7.5 | |
| 12 | CAI – 11 | -6 | 34E | 73 | 31E | 4 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.