Daily Sunspot Evaluation
Observation Sheet Thursday, 28 July 1988
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)
- 4
- Number of spots (f)
- 50
- Relative number (R)
- 90
- Observer
- HE
- Reading
- all checks consistent
- File
- 19880728.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXO – 3 | 25 | 54W | 69 | 56W | 6 | 161 |
| 2 | HS – 1 | 13 | 3E | 12 | 1E | 2 | 153 |
| 3 | FKC – 13 | 29 | 70E | 305 | 68E | 19 | 159 |
| 4 | DKB – 33 | -21 | 16E | 359 | 14E | 8 | 156 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.