Daily Sunspot Evaluation
Observation Sheet Thursday, 9 April 1987
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)
- 4
- Number of spots (f)
- 42
- Relative number (R)
- 82
- Observer
- HM
- Reading
- counts consistent, some coordinates doubtful
- File
- 19870409.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | EKC – 20 | -23 | 04E | 137 ⚠ | 01E | 12 | 15 |
| 2 | EKI – 15 | -31 | 46E | 135 | 43E | 13 | 16 |
| 3 | DAI – 6 | -5 | 59E | 122 | 56E | 5 | 14 |
| 4 | ARX – 1 | -5 | 67E | 114 | 64E | 19 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.