Daily Sunspot Evaluation
Observation Sheet Thursday, 20 October 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)
- 5
- Number of spots (f)
- 33
- Relative number (R)
- 83
- Observer
- FA
- Reading
- all checks consistent
- File
- 19771020.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 14 | -24 | 16E | 83 | 13E | ||
| 2 | J – 1 | 17 | 61W | 160 | 64W | ||
| 3 | A – 3 | 21 | 67W | 166 | 70W | ||
| 4 | C – 13 | 21 | 49W | 148 | 52W | ||
| 5 | A – 2 | 23 | 11W | 110 | 14W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.