Daily Sunspot Evaluation
Observation Sheet Thursday, 15 August 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)
- 14
- Number of spots (f)
- 77
- Relative number (R)
- 217
- Observer
- SG0
- Reading
- all checks consistent
- File
- 19910815.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 2 | 8 | 02W | 87 | 05W | 1 | 432 |
| 2 | HA – 2 | 23 | 38E | 47 | 35E | 1.5 | 436 |
| 3 | AX – 3 | 8 | 48E | 37 | 45E | 2 | 442 |
| 4 | ? – 1 | 10 | 85E | 0 | 82E | - | 444 |
| 5 | HA – 1 | -24 | 75W | 160 | 75W | 1.5 | 423 |
| 6 | DAO – 7 | -12 | 50W | 135 | 53W | 7.5 | 429 |
| 7 | HA – 2 | -24 | 27W | 112 | 30W | 5 | 431 |
| 8 | CAI – 7 | -8 | 41E | 44 | 38E | 10 | 438 |
| 9 | CAI – 17 | -20 | 44E | 41 | 41E | 7 | 445 |
| 10 | DAI – 21 | -17 | 54E | 31 | 051E | 9 | 440 |
| 11 | DKC – 7 | -11 | 59E | 26 | 56E | 8 | 441 |
| 12 | AX – 2 | -6 | 64E | 21 | 61E | 0.5 | 446 |
| 13 | ? – 4 | -10 | 76E | 9 | 73E | 9 | 447 |
| 14 | ? – 1 | -5 | 85E | 0 | 82E | - | 448 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.