Daily Sunspot Evaluation
Observation Sheet Wednesday, 20 May 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)
- 5
- Number of spots (f)
- 81
- Relative number (R)
- 131
- Observer
- GT
- Reading
- all checks consistent
- File
- 19810520.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EKC – 39 | 14 | 36W | 154 | 38W | 26 | |
| 2 | AXX – 3 | 21 | 16W | 134 | 19W | ||
| 3 | CAO – 7 | -27 | 44W | 162 | 47W | 35 | |
| 4 | HKI – 27 | -25 | 01E | 117 | 02W | 635 | |
| 5 | AXX – 5 | -28 | 08E | 110 | 05E | 1 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.