Daily Sunspot Evaluation
Observation Sheet Tuesday, 28 April 1970
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)
- 69
- Relative number (R)
- 169
- Observer
- SM
- Reading
- all checks consistent
- File
- 19700428.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | C – 17 | 9 | 28E | 134 | |||
| 2 | B – 5 | 10 | 34E | 128 | |||
| 3 | D – 10 | -8 | 42E | 120 | |||
| 4 | C – 12 | -10 | 53E | 109 | |||
| 5 | ? – 1 | -16 | 83E | 79 | |||
| 6 | J – 7 | -15 | 02E | 160 | |||
| 7 | J – 1 | -9 | 70W | 232 | |||
| 8 | J – 7 | 9 | 68W | 230 | |||
| 9 | B – 6 | 11 | 32W | 194 | |||
| 10 | A – 3 | 7 | 10W | 172 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.