Daily Sunspot Evaluation
Observation Sheet Wednesday, 13 May 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)
- 6
- Relative number (R)
- 26
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19870513.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BRO – 2 | 27 | 26W | 118 | 28W | 4.25 | 30 |
| 2 | CAO – 4 | -32 | 25W | 117 | 27W | 8 | 27 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.