Daily Sunspot Evaluation
Observation Sheet Thursday, 18 June 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)
- 98
- Relative number (R)
- 178
- Observer
- TÖ
- Reading
- counts consistent, some coordinates doubtful
- File
- 19810618.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAO – 10 | 15 | 69W | 164 | 72W | 9.5 | |
| 2 | CRI – 18 | 7 | 04W | 99 | 07W | 6E | |
| 3 | BRO – 5 | 17 | 11E | 84 | 08E | 3 | |
| 4 | DAI – 13 | -26 | 57W | 152 | 60W | 8 | |
| 5 | ARX – 1 | -23 | 35W | 130 | 38W | 0.5 | |
| 6 | OKO – 6 | -23 | 17W | 112 | 20W | 8.5 | |
| 7 | ERC – 35 | -21 | 00 | 95 | 08W | 11.5 | |
| 8 | BXI – 10 | -28 | 43E | 92 ⚠ | 40E | 4° |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.