Daily Sunspot Evaluation
Observation Sheet Thursday, 1 April 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)
- 35
- Relative number (R)
- 95
- Observer
- FA
- Reading
- all checks consistent
- File
- 19710401.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | D – 15 | 12 | 13°E | 5 | |||
| 2 | J – 1 | 13 | 81°E | 299 | |||
| 3 | A – 3 | -11 | 03°W | 21 | |||
| 4 | H – 12 | -20 | 15°W | 33 | |||
| 5 | A – 3 | -18 | 12°W | 30 | |||
| 6 | J – 1 | -15 | 50°W | 68 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.