Daily Sunspot Evaluation
Observation Sheet Sunday, 19 July 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)
- 2
- Number of spots (f)
- 4
- Relative number (R)
- 24
- Observer
- FL
- Reading
- all checks consistent
- File
- 19870719.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AXX – 2 | -28 | 28E | 258 | 25E | 2 50 | 42 |
| 2 | DAO – 2 | -32 | 41E | 245 | 38E | 3 49 | 41 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.