Daily Sunspot Evaluation
Observation Sheet Thursday, 28 June 1990
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)
- 103
- Relative number (R)
- 213
- Observer
- HÇ0
- Reading
- all checks consistent
- File
- 19900628.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BRO – 9 | 15 | 27W | 165 | 31W | 4 | 273 |
| 2 | BXI – 8 | 23 | 14W | 152 | 18W | 7.5 | 275 |
| 3 | HS – 1 | 27 | 07W | 145 | 11W | 1.5 | 262 |
| 4 | BXI – 8 | 4 | 24E | 114 | 20E | 4.5 | E286 |
| 5 | EKC – 10 | 8 | 58E | 80 | 54E | 10 | E296 |
| 6 | CAI – 6 | -11 | 44W | 182 | 48W | 7.5 | 264 |
| 7 | BRO – 14 | -8 | 28W | 166 | 32W | 7 | E259 |
| 8 | FKI – 29 | -22 | 17E | 121 | 13E | 18 | E266 |
| 9 | AX – 6 | -13 | 52E | 86 | 48E | 3 | 224 |
| 10 | FAI – 11 | -20 | 63E | 75 | 59E | 13 | E229 |
| 11 | ? – 1 | -28 | 78E | 60 | 74E | 3 | 228 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.