Daily Sunspot Evaluation
Observation Sheet Thursday, 11 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)
- 4
- Number of spots (f)
- 31
- Relative number (R)
- 71
- Observer
- FA
- Reading
- all checks consistent
- File
- 19710311.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 20 | 54°E | 241 | |||
| 2 | ? – 1 | -4 | 82°E | 213 | |||
| 3 | D – 11 | -15 | 32°E | 263 | |||
| 4 | D – 18 | -8 | 02°W | 297 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.