Daily Sunspot Evaluation
Observation Sheet Friday, 15 September 1972
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)
- 5
- Number of spots (f)
- 29
- Relative number (R)
- 79
- Observer
- FA
- Reading
- counts consistent, some coordinates doubtful
- File
- 19720915.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 6 | 12 | 49E | 132 | |||
| 2 | C – 11 | 7 | 23E | 152 ⚠ | |||
| 3 | J – 4 | -9 | 19E | 162 | |||
| 4 | C – 7 | -12 | 04W | 185 | |||
| 5 | J – 1 | 20 | 62W | 243 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.