Daily Sunspot Evaluation
Observation Sheet Friday, 13 July 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)
- 11
- Number of spots (f)
- 60
- Relative number (R)
- 170
- Observer
- MS
- Reading
- all checks consistent
- File
- 20010713.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HS – 1 | 6 | 52W | 238 | 55W | ~1.5 | |
| 2 | AX – 5 | 11 | 19E | 167 | 16E | ~1.5 | |
| 3 | CAO – 2 | 7 | 44E | 142 | 41E | ~6 | |
| 4 | AX – 2 | 13 | 51E | 135 | 48E | 1 | |
| 5 | HS – 1 | 17 | 65E | 121 | 62E | 4 | |
| 6 | CSO – 2 | 17 | 80E | 106 | 77E | ~7 | |
| 7 | DRO – 11 | -6 | 36W | 222 | 39W | 8 | |
| 8 | BRI – 13 | -9 | 15W | 201 | 18W | ~7.5 | |
| 9 | AX – 1 | -15 | 14E | 172 | 11E | - | |
| 10 | DRI – 16 | -8 | 21E | 165 | 18E | 6 | |
| 11 | DRI – 6 | -18 | 23E | 163 | 20E | 9.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.