Daily Sunspot Evaluation
Observation Sheet Thursday, 20 June 1991
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)
- 7
- Number of spots (f)
- 42
- Relative number (R)
- 112
- Observer
- TÖ0
- Reading
- all checks consistent
- File
- 19910620.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CSO – 9 | 8 | 14E | 91 | 12E | 6 | 302 |
| 2 | AR – 4 | 16 | 21E | 84 | 19E | 2 | 313 |
| 3 | HS – 1 | 22 | 56E | 49 | 54E | 2 | 310 |
| 4 | CAO – 7 | -15 | 42W | 147 | 44W | 6 | 300 |
| 5 | DAC – 16 | -12 | 27W | 132 | 29W | 8 | 300 |
| 6 | AX – 1 | -28 | 12W | 117 | 14W | 301 | |
| 7 | CAO – 4 | -16 | 49E | 56 | 47E | 6.5 | 314 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.