Daily Sunspot Evaluation
Observation Sheet Wednesday, 15 April 1981
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)
- —
- Number of spots (f)
- —
- Relative number (R)
- —
- Observer
- GT
- Reading
- reading could not be verified
- File
- 19810415.jpg
Sunspot groups
The table of this sheet could not be read reliably (R total misread/observer arithmetic). See the drawing for the groups.