Daily Sunspot Evaluation
Observation Sheet Monday, 18 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)
- 3
- Number of spots (f)
- 45
- Relative number (R)
- 75
- Observer
- TS
- Reading
- all checks consistent
- File
- 19870518.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EKC – 29 | 31 | 43E | 343 | 40E | 12 35 | 31 |
| 2 | BRI – 7 | -21 | 54W | 80 | 57W | 7 37 | 29 |
| 3 | HAX – 9 | -24 | 38E | 348 | 35E | 2 26 | 32 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.