Daily Sunspot Evaluation
Observation Sheet Friday, 13 April 1984
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)
- 1
- Number of spots (f)
- 12
- Relative number (R)
- 22
- Observer
- HM
- Reading
- all checks consistent
- File
- 19840413.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DKI – 12 | 9 | 39E | 140 | 38E | 10.5 41 | 72 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.