Daily Sunspot Evaluation
Observation Sheet Wednesday, 31 March 1971
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)
- 6
- Number of spots (f)
- 23
- Relative number (R)
- 83
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710331.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 8 | 13 | 26E | 5 | |||
| 2 | A – 1 | -11 | 04E | 27 | |||
| 3 | B – 2 | -15 | 04E | 27 | |||
| 4 | H – 9 | -19 | 02W | 33 | |||
| 5 | J – 1 | -14 | 37W | 68 | |||
| 6 | J – 2 | 25 | 07W | 38 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.