Daily Sunspot Evaluation
Observation Sheet Saturday, 6 April 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)
- 13
- Number of spots (f)
- 115
- Relative number (R)
- 245
- Observer
- HE
- Reading
- all checks consistent
- File
- 19910406.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAI – 36 | 14 | 42W | 58 | 44W | 8 | 138 |
| 2 | EAC – 22 | 9 | 14W | 30 | 16W | 11 | 139 |
| 3 | HA – 1 | 9 | 46E | 330 | 44E | 1 | 143 |
| 4 | AR – 1 | 26 | 48E | 328 | 46E | 1 | 149 |
| 5 | CKO – 17 | -12 | 40W | 56 | 42W | 9 | 141 |
| 6 | AX – 2 | -10 | 13W | 29 | 15W | 1 | 150 |
| 7 | BXI – 7 | -20 | 09W | 25 | 11W | 4 | 151 |
| 8 | AX – 2 | -12 | 06E | 10 | 04E | 1 | 152 |
| 9 | CAO – 14 | -13 | 20E | 356 | 18E | 6.5 | 144 |
| 10 | AR – 2 | -19 | 20E | 356 | 18E | 0.5 | 145 |
| 11 | AR – 7 | -22 | 26E | 350 | 24E | 1.5 | 146 |
| 12 | AR – 2 | -12 | 32E | 344 | 30E | 1.5 | 153 |
| 13 | AR – 2 | -8 | 43E | 335 | 41E | 0.5 | 148 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.