Daily Sunspot Evaluation
Observation Sheet Friday, 23 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)
- 21
- Relative number (R)
- 51
- Observer
- GA
- Reading
- counts consistent, some coordinates doubtful
- File
- 19770923.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 18 | 24E | 21 ⚠ | 21E | ||
| 2 | D – 18 | -23 | 04W | 39 ⚠ | 07W | ||
| 3 | ? – 2 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.