Daily Sunspot Evaluation
Observation Sheet Thursday, 13 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)
- 23
- Relative number (R)
- 53
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19870813.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAI – 14 | -26 | 32E | 283 | 29E | 4 | 54 |
| 2 | HKX – 4 | -31 | 66E | 249 | 63E | 4 | 56 |
| 3 | ? – 5 | 57 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.