Daily Sunspot Evaluation
Observation Sheet Friday, 21 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)
- 11
- Number of spots (f)
- 97
- Relative number (R)
- 207
- Observer
- HÇ0
- Reading
- all checks consistent
- File
- 19910621.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | 18 | 77W | 170 | 80W | 5.5 | 315 |
| 2 | CAI – 10 | 8 | 01E | 92 | 02W | 5.5 | 312 |
| 3 | CAI – 14 | 17 | 07E | 84 | 06E | 5.5 | 313 |
| 4 | HA – 1 | 22 | 45E | 50 | 40E | 1.5 | 310 |
| 5 | CAI – 18 | -15 | 56W | 149 | 59W | 7 | 300 |
| 6 | DAC – 34 | -12 | 40W | 133 | 43W | 9.5 | 304 |
| 7 | AX – 3 | -30 | 16W | 109 | 19W | 1 | 316 |
| 8 | AR – 6 | -28 | 09W | 102 | 12W | 3 | 317 |
| 9 | CAO – 8 | -16 | 38E | 55 | 35E | 6.5 | 314 |
| 10 | AX – 1 | -15 | 70E | 23 | 67E | 318 | |
| 11 | AR – 1 | -26 | 77E | 16 | 74E | 1 | 319 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.