Daily Sunspot Evaluation
Observation Sheet Tuesday, 13 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)
- 12
- Number of spots (f)
- 63
- Relative number (R)
- 183
- Observer
- HÇ0
- Reading
- all checks consistent
- File
- 19910813.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXI – 12 | 9 | 09W | 120 | 12W | 4 | 428 |
| 2 | AX – 4 | 8 | 14E | 97 | 11E | 2 | 439 |
| 3 | BXO – 10 | 5 | 21E | 90 | 18E | 5 | 432 |
| 4 | HA – 3 | 23 | 65E | 46 | 62E | 3 | 436 |
| 5 | HA – 1 | -25 | 49W | 160 | 52W | 1.5 | 423 |
| 6 | AR – 1 | -21 | 31W | 142 | 34W | 0.5 | 437 |
| 7 | BRI – 14 | -11 | 23W | 134 | 26W | 5.5 | 429 |
| 8 | HA – 1 | -23 | 02W | 113 | 05W | 2.5 | 431 |
| 9 | CAI – 5 | -21 | 50E | 61 | 47E | 6.5 | 434 |
| 10 | CAO – 6 | -8 | 66E | 45 | 63E | 11 | 438 |
| 11 | ? – 3 | -20 | 79E | 32 | 76E | 3 | 440 |
| 12 | ? – 3 | -10 | 84E | 27 | 81E | 4 | 441 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.