Daily Sunspot Evaluation
Observation Sheet Thursday, 20 August 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)
- 44
- Relative number (R)
- 74
- Observer
- TS
- Reading
- all checks consistent
- File
- 19870820.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HAX – 5 | -25 | 58W | 280 | 61W | 7.5 | 54 |
| 2 | HKX – 21 | -32 | 22W | 244 | 25W | 7 | 56 |
| 3 | CAO – 18 | -23 | 15W | 237 | 18W | 8 | 57 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.