Daily Sunspot Evaluation
Observation Sheet Thursday, 13 April 1989
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)
- 8
- Number of spots (f)
- 30
- Relative number (R)
- 110
- Observer
- YK
- Reading
- all checks consistent
- File
- 19890413.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BRO – 7 | 35 | 28W | 227 | 30W | 8.25 | 181 |
| 2 | BXO – 4 | 18 | 05W | 204 | 07W | 6 | 182 |
| 3 | AX – 2 | 23 | 02W | 201 | 04W | 0.5 | 183 |
| 4 | HS – 1 | 15 | 58E | 141 | 56E | 1.5 | 184 |
| 5 | EAC – 6 | 9 | 75E | 124 | 73E | 10.5 | 185 |
| 6 | BRO – 4 | -16 | 55W | 254 | 57W | 3.5 | 186 |
| 7 | AX – 1 | -15 | 51W | 250 | 53W | - | 187 |
| 8 | EAO – 5 | -21 | 39E | 160 | 37E | 11 | 188 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.