Daily Sunspot Evaluation
Observation Sheet Wednesday, 13 April 1988
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)
- 41
- Relative number (R)
- 121
- Observer
- AÖ0
- Reading
- counts consistent, some coordinates doubtful
- File
- 19880413.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HA – 3 | 25 | 64W | 40 | 65W | 2 | 65 |
| 2 | HA – 2 | 19 | 60W | 36 | 61W | 2 | 69 |
| 3 | AX – 1 | 26 | 39W | 15 | 40W | 0.25 | 75 |
| 4 | EKC – 10 | 17 | 07E | 329 | 06E | 10 | 67 |
| 5 | FKC – 15 | 22 | 64E | 272 | 63E | 17.5 | 71 |
| 6 | HS – 1 | -31 | 11W | 342 ⚠ | 12W | 2.5 | 66 |
| 7 | HS – 1 | -19 | 04E | 332 | 03E | 1 | 68 |
| 8 | DAE – 8 | -14 | 20E | 316 | 19E | 6.5 | 69 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.