Daily Sunspot Evaluation
Observation Sheet Sunday, 21 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)
- 5
- Number of spots (f)
- 32
- Relative number (R)
- 82
- Observer
- DK
- Reading
- counts consistent, some coordinates doubtful
- File
- 19710321.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 3 | -8 | 40E | 125 | |||
| 2 | C – 18 | -15 | 13E | 152 | |||
| 3 | ? – 6 | -6 | 72W | 237 | |||
| 4 | B – 4 | -4 | 43W | 214 ⚠ | |||
| 5 | ? – 1 | 19 | 74W | 239 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.