Daily Sunspot Evaluation
Observation Sheet Sunday, 28 June 1987
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)
- 3
- Number of spots (f)
- 8
- Relative number (R)
- 38
- Observer
- HM
- Reading
- all checks consistent
- File
- 19870628.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HAX – 3 | 20 | 61W | 262 | 61W | 1.7543 | 37 |
| 2 | DSO – 3 | 30 | 46E | 155 | 46E | 11.45 | 38 |
| 3 | BXO – 2 | -32 | 24W | 225 | 24W | 3.46 | 35 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.