Daily Sunspot Evaluation
Observation Sheet Tuesday, 18 September 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)
- 10
- Number of spots (f)
- 55
- Relative number (R)
- 155
- Observer
- SM
- Reading
- all checks consistent
- File
- 19790918.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 2 | 27 | 83E | 163 | 80E | 214 | |
| 2 | E – 20 | 5 | 56E | 190 | 53E | 211 | |
| 3 | A – 1 | -13 | 74E | 172 | 71E | 215 | |
| 4 | ? – 1 | -20 | 80E | 166 | 77E | 216 | |
| 5 | J – 2 | -21 | 51E | 195 | 48E | 212 | |
| 6 | A – 1 | -11 | 18E | 228 | 15E | 206 | |
| 7 | A – 4 | -11 | 06W | 252 | 09W | 210 | |
| 8 | H – 10 | -26 | 18W | 264 | 21W | 200 | |
| 9 | A – 3 | -10 | 39W | 285 | 42W | 213 | |
| 10 | E – 11 | 9 | 61W | 307 | 64W | 196 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.