Daily Sunspot Evaluation
Observation Sheet Wednesday, 17 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)
- 8
- Number of spots (f)
- 58
- Relative number (R)
- 138
- Observer
- MB
- Reading
- all checks consistent
- File
- 19910717.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HA – 1 | 21 | 56E | 52 | 53E | 1 | 361 |
| 2 | CAO – 5 | -24 | 57W | 165 | 60W | 13 | 358 |
| 3 | AX – 4 | -27 | 48W | 156 | 51W | 1.5 | 324 |
| 4 | HA – 2 | -11 | 33W | 141 | 36W | 02 | 365 |
| 5 | DAI – 22 | -15 | 29W | 137 | 32W | 8.5 | 371 |
| 6 | AX – 1 | -1 | 04E | 104 | 01E | - | 385 |
| 7 | HK – 13 | -26 | 22E | 86 | 13E | 06 | 374 |
| 8 | CAI – 10 | -22 | 43E | 65 | 40E | 04 | 380 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.