Daily Sunspot Evaluation
Observation Sheet Friday, 16 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)
- 8
- Number of spots (f)
- 83
- Relative number (R)
- 163
- Observer
- MA
- Reading
- all checks consistent
- File
- 19710416.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | G – 4 | 2 | 03E | 179 | |||
| 2 | J – 1 | 20 | 22E | 160 | |||
| 3 | C – 21 | 21 | 35E | 147 | |||
| 4 | G – 13 | 9 | 28E | 154 | |||
| 5 | H – 3 | -6 | 07E | 175 | |||
| 6 | J – 5 | -17 | 32E | 150 | |||
| 7 | D – 16 | -5 | 25W | 207 | |||
| 8 | C – 20 | -4 | 35W | 217 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.