Daily Sunspot Evaluation
Observation Sheet Monday, 15 September 1980
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)
- 7
- Number of spots (f)
- 21
- Relative number (R)
- 91
- Observer
- OG
- Reading
- all checks consistent
- File
- 19800915.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AKX – 2 | 8 | 40W | 173 | 41W | 0.5 | |
| 2 | BXO – 3 | 14 | 27W | 159 | 27W | 4 | |
| 3 | HKX – 5 | 14 | 17W | 149 | 17W | 6 | |
| 4 | CJO – 4 | -9 | 16W | 148 | 16W | 7 | |
| 5 | HAX – 2 | -9 | 13E | 119 | 13E | 1.5 | |
| 6 | DAO – 4 | -11 | 22E | 110 | 22E | 5.5 | |
| 7 | HAX – 1 | -31 | 75E | 57 | 75E | - |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.