Daily Sunspot Evaluation
Observation Sheet Saturday, 13 July 1991
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
- MB
- Reading
- all checks consistent
- File
- 19910713.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DKC – 24 | 36 | 60W | 221 | 63W | 10 | 349 |
| 2 | HA – 11 | 12 | 51W | 212 | 54W | 4 | 350 |
| 3 | AX – 1 | 18 | 10E | 151 | 07E | 374 | |
| 4 | AX – 1 | -18 | 56W | 217 | 59W | 351 | |
| 5 | EKC – 23 | -24 | 04W | 165 | 01W | 15 | 358 |
| 6 | HA – 6 | -11 | 21E | 140 | 18E | 2.5 | 345 |
| 7 | DAC – 30 | -16 | 24E | 137 | 21E | 10 | 371 |
| 8 | AX – 4 | -5 | 56E | 105 | 53E | 2 | 376 |
| 9 | ? – 1 | -21 | 75E | 86 | 72E | 3 | 378 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.