Daily Sunspot Evaluation
Observation Sheet Friday, 13 May 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)
- 3
- Number of spots (f)
- 11
- Relative number (R)
- 41
- Observer
- SG0
- Reading
- all checks consistent
- File
- 19880513.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BRI – 3 | 14 | 59W | 0 | 62W | 3 | 100 |
| 2 | AR – 1 | 17 | 31W | 332 | 34W | 0.75 | 91 |
| 3 | CAE – 7 | -16 | 23W | 324 | 26W | 7.5 | 95 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.