Daily Sunspot Evaluation
Observation Sheet Monday, 18 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)
- 59
- Relative number (R)
- 139
- Observer
- HM
- Reading
- all checks consistent
- File
- 19880418.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HA – 3 | 11 | 61W | 333 | 64W | 2.5 | 67 |
| 2 | EKI – 19 | 22 | 10W | 282 | 13W | 11 | 71 |
| 3 | CKI – 9 | 22 | 06E | 266 | 03E | 8 | 74 |
| 4 | DAI – 19 | 24 | 32E | 240 | 29E | 8 | 75 |
| 5 | HA – 1 | -31 | 72W | 344 | 75W | 2 | 66 |
| 6 | CAE – 3 | -33 | 57W | 329 | 60W | 5 | 76 |
| 7 | DAO – 3 | -15 | 45W | 317 | 48W | 10 | 64 |
| 8 | AX – 2 | -27 | 28W | 300 | 31W | - | 78 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.