Daily Sunspot Evaluation
Observation Sheet Thursday, 18 August 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)
- 4
- Number of spots (f)
- 21
- Relative number (R)
- 61
- Observer
- FA
- Reading
- all checks consistent
- File
- 19770818.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 8 | 23 | 34E | 177 | 31E | ||
| 2 | A – 1 | -26 | 58E | 153 | 55E | ||
| 3 | B – 5 | 19 | 32W | 243 | 35W | ||
| 4 | C – 7 | 28 | 03W | 214 | 06W |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.