Daily Sunspot Evaluation
Observation Sheet Thursday, 16 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)
- 9
- Number of spots (f)
- 101
- Relative number (R)
- 191
- Observer
- TA
- Reading
- all checks consistent
- File
- 19990916.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CRO – 2 | 19 | 68W | 43 | 71W | 4 | |
| 2 | EKC – 28 | 15 | 52W | 27 | 55W | 12 | |
| 3 | HA – 1 | 12 | 33W | 8 | 36W | 1 | |
| 4 | EKO – 19 | 22 | 29W | 4 | 32W | ~10.5 | |
| 5 | HA – 2 | 21 | 07E | 328 | 04E | 1 | |
| 6 | AX – 4 | 11 | 36E | 299 | 33E | 1 | |
| 7 | AX – 2 | 22 | 39E | 298 | 34E | 0.5 | |
| 8 | CKO – 18 | 14 | 45E | 290 | 42E | 6.5 | ? |
| 9 | DSI – 25 | -26 | 30W | 5 | 33W | 13 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.