Daily Sunspot Evaluation
Observation Sheet Thursday, 28 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)
- 20
- Relative number (R)
- 70
- Observer
- ED
- Reading
- all checks consistent
- File
- 19720928.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | B – 5 | 8 | 04E | 5 | |||
| 2 | C – 6 | -8 | 34E | 335 | |||
| 3 | E – 6 | -5 | 28W | 37 | |||
| 4 | J – 1 | -15 | 71W | 80 | |||
| 5 | A – 2 | 15 | 71W | 80 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.