Daily Sunspot Evaluation
Observation Sheet Tuesday, 18 December 1979
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)
- 11
- Number of spots (f)
- 42
- Relative number (R)
- 152
- Observer
- OG
- Reading
- all checks consistent
- File
- 19791218.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 7 | -15 | 52E | 71 | 52E | 399 | |
| 2 | A – 1 | -29 | 24E | 100 | 23E | 400 | |
| 3 | G – 5 | -19 | 14W | 138 | 15W | 390 | |
| 4 | J – 2 | -13 | 13W | 137 | 14W | 392 | |
| 5 | G – 4 | -25 | 55W | 179 | 56W | 396 | |
| 6 | J – 1 | -19 | 70W | 194 | 71W | 398 | |
| 7 | A – 1 | 12 | 68W | 192 | 69W | 373 | |
| 8 | G – 5 | 9 | 35W | 159 | 36W | 395 | |
| 9 | E – 14 | 16 | 56W | 179 | 56W | 389 | |
| 10 | J – 1 | 19 | 68W | 192 | 69W | 372 | |
| 11 | J – 1 | 23 | 58W | 179 | 56W | 375 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.