Daily Sunspot Evaluation
Observation Sheet Thursday, 13 September 2001
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)
- 148
- Relative number (R)
- 238
- Observer
- TA
- Reading
- all checks consistent
- File
- 20010913.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DRS – 14 | 21 | 29W | 115 | 32W | 9 | |
| 2 | AX – 1 | 15 | 31E | 55 | 28E | - | |
| 3 | DAI – 8 | 9 | 66E | 20 | 63E | 4 | |
| 4 | HS – 1 | -17 | 70W | 156 | 73W | ~2 | |
| 5 | CAO – 11 | -16 | 42W | 128 | 45W | ~11 | |
| 6 | FKC – 42 | -27 | 20W | 106 | 23W | 29 | |
| 7 | BXI – 7 | -21 | 17W | 103 | 20W | 6 | |
| 8 | EAC – 49 | -14 | 08W | 94 | 11W | 13 | |
| 9 | EAC – 15 | -12 | 65E | 21 | 62E | 13 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.