Daily Sunspot Evaluation
Observation Sheet Thursday, 20 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)
- 13
- Number of spots (f)
- 101
- Relative number (R)
- 231
- Observer
- FY
- Reading
- counts consistent, some coordinates doubtful
- File
- 19790920.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 17 | 27 | 56E | 164 | 53E | 219 | |
| 2 | A – 1 | 12 | 54E | 164 | 51E | 218 | |
| 3 | F – 49 | 6 | 28E | 192 | 25E | 211 | |
| 4 | A – 1 | -13 | 42E | 172 ⚠ | 45E | 215 | |
| 5 | D – 14 | -20 | 56E | 164 | 53E | 216 | |
| 6 | A – 4 | -9 | 26E | 194 | 23E | 219 | |
| 7 | J – 1 | -21 | 25E | 195 | 22E | 212 | |
| 8 | A – 2 | -22 | 11E | 209 | 08E | 217 | |
| 9 | H – 8 | -27 | 46W | 266 | 49W | 200 | |
| 10 | A – 1 | -10 | 66W | 286 | 69W | 213 | |
| 11 | J – 1 | 8 | 84W | 304 | 87W | 196 | |
| 12 | A – 1 | 26 | 55W | 275 | 58W | 220 | |
| 13 | A – 1 | 22 | 26W | 246 | 29W | 221 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.