Daily Sunspot Evaluation
Observation Sheet Monday, 15 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)
- 62
- Relative number (R)
- 152
- Observer
- SG0
- Reading
- all checks consistent
- File
- 19910715.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 7 | 37 | 81W | 216 | 84W | 8 | 349 |
| 2 | HA – 2 | 11 | 78W | 213 | 81W | 3 | 350 |
| 3 | ? – 1 | 22 | 86E | 50 | 83E | 381 | |
| 4 | FKI – 19 | -23 | 29W | 164 | 32W | 16 | 358 |
| 5 | HA – 2 | -11 | 05W | 140 | 08W | 2 | 365 |
| 6 | EAI – 20 | -16 | 03W | 138 | 06W | 11 | 391 |
| 7 | AX – 1 | -5 | 26E | 109 | 23E | 376 | |
| 8 | HA – 5 | -26 | 50E | 85 | 47E | 4 | 378 |
| 9 | HA – 5 | -22 | 71E | 64 | 68E | 2.5 | 380 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.