Daily Sunspot Evaluation
Observation Sheet Friday, 13 August 1999
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)
- 7
- Number of spots (f)
- 40
- Relative number (R)
- 110
- Observer
- SB0
- Reading
- all checks consistent
- File
- 19990813.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HS – 4 | 23 | 65E | 359 | 65E | 4 | |
| 2 | AX – 1 | 2 | 37E | 29 | 35E | ||
| 3 | HS – 1 | 12 | 77E | 349 | 75E | 3 | |
| 4 | ? – 1 | 22 | 89E | 335 | 89E | ||
| 5 | HA – 1 | -31 | 61W | 125 | 63W | ~2 | HS-1 |
| 6 | HA – 1 | -13 | 31W | 95 | 33W | 1 | HS-1 |
| 7 | EKI – 31 | -19 | 22W | 86 | 24W | 13 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.