Daily Sunspot Evaluation
Observation Sheet Tuesday, 7 April 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)
- 23
- Relative number (R)
- 53
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19870407.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AXX – 4 | -25 | 02E | 205 | 01W | 1.5 | 17 |
| 2 | DKC – 14 | -23 | 29E | 178 | 26E | 9 | 15 |
| 3 | DAO – 5 | -32 | 71E | 136 | 68E | 10 | 16 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.