Daily Sunspot Evaluation
Observation Sheet Monday, 19 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)
- 11
- Number of spots (f)
- 95
- Relative number (R)
- 205
- Observer
- FA
- Reading
- all checks consistent
- File
- 19710419.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 6 | 13 | 18E | 125 | |||
| 2 | J – 4 | -11 | 67E | 76 | |||
| 3 | C – 9 | -18 | 07W | 150 | |||
| 4 | H – 8 | -6 | 33W | 176 | |||
| 5 | J – 1 | -5 | 77W | 220 | |||
| 6 | J – 2 | -3 | 67W | 210 | |||
| 7 | J – 1 | 2 | 41W | 184 | |||
| 8 | A – 3 | 19 | 68W | 211 | |||
| 9 | E – 15 | 9 | 13W | 156 | |||
| 10 | C – 7 | 20 | 15W | 158 | |||
| 11 | E – 39 | 21 | 06W | 149 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.