Daily Sunspot Evaluation
Observation Sheet Monday, 21 September 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)
- 5
- Relative number (R)
- 25
- Observer
- HG
- Reading
- all checks consistent
- File
- 19870921.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HSX – 1 | 13 | 26E | 133 | 24E | 2.78 | 68 |
| 2 | CAO – 4 | -30 | 36W | 195 | 38W | 7.574 | 69 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.