Daily Sunspot Evaluation
Observation Sheet Thursday, 9 September 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)
- 42
- Relative number (R)
- 112
- Observer
- TA
- Reading
- all checks consistent
- File
- 19990909.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXO – 2 | 18 | 75W | 142 | 78W | 5 | |
| 2 | AX – 2 | 20 | 51W | 118 | 54W | 0.5 | |
| 3 | DRI – 14 | 13 | 43E | 24 | 40E | ~4.5 | |
| 4 | HA – 2 | 11 | 61E | 6 | 58E | ~1.5 | |
| 5 | DRO – 6 | -30 | 49W | 116 | 52W | ~9 | |
| 6 | HR – 4 | -16 | 19W | 84 | 20W | 1 | |
| 7 | EKO – 12 | -26 | 59E | 8 | 56E | 11.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.