Daily Sunspot Evaluation
Observation Sheet Wednesday, 21 September 1977
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)
- 3
- Number of spots (f)
- 39
- Relative number (R)
- 69
- Observer
- FA
- Reading
- all checks consistent
- File
- 19770921.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | 25 | 07E | 114 | 04E | ||
| 2 | E – 29 | -23 | 23E | 98 | 20E | ||
| 3 | ? – 8 | 7 | 79W | 200 | 82W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.