Daily Sunspot Evaluation
Observation Sheet Saturday, 13 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)
- 10
- Number of spots (f)
- 85
- Relative number (R)
- 185
- Observer
- TÖ0
- Reading
- counts consistent, some coordinates doubtful
- File
- 19910413.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HS – 1 | 5 | 41W | 323 | 50W | 1.5 | 143 |
| 2 | AR – 2 | 6 | 25W | 310 | 28W | 1 | 154 |
| 3 | DAC – 12 | 29 | 00 | 285 | 03W | 3.5 | 155 |
| 4 | EKC – 35 | 9 | 47E | 228 ⚠ | 44E | 14.5 | 159 |
| 5 | BXI – 6 | 15 | 70E | 215 | 67E | 10 | 169 |
| 6 | CAO – 4 | -20 | 67W | 352 | 70W | 8 | 146 |
| 7 | HA – 2 | -23 | 63W | 348 | 66W | 2 | 168 |
| 8 | CAI – 12 | -11 | 51W | 336 | 54W | 13 | 148 |
| 9 | BXI – 10 | -25 | 28E | 257 | 25E | 14 | 165 |
| 10 | AR – 1 | -27 | 56E | 229 | 53E | 1 | 166 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.