Daily Sunspot Evaluation
Observation Sheet Tuesday, 31 March 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)
- 65
- Relative number (R)
- 165
- Observer
- SM
- Reading
- all checks consistent
- File
- 19700331.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 20 | 4 | 10E | 161 | |||
| 2 | ? – 1 | -11 | 82E | 89 | |||
| 3 | A – 2 | -13 | 49E | 122 | |||
| 4 | ? – 1 | -14 | 84E | 87 | |||
| 5 | A – 2 | -19 | 27W | 198 | |||
| 6 | C – 16 | -9 | 60W | 231 | |||
| 7 | C – 11 | -3 | 16W | 187 | |||
| 8 | J – 2 | 13 | 68W | 239 | |||
| 9 | B – 7 | 21 | 51W | 222 | |||
| 10 | B – 3 | 5 | 04W | 175 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.