Daily Sunspot Evaluation
Observation Sheet Friday, 12 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)
- 6
- Number of spots (f)
- 39
- Relative number (R)
- 99
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710312.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 2 | 19 | 43E | 241 | |||
| 2 | G – 3 | 7 | 75E | 209 | |||
| 3 | J – 1 | -4 | 70E | 214 | |||
| 4 | D – 13 | -16 | 21E | 263 | |||
| 5 | C – 15 | -8 | 14W | 296 | |||
| 6 | B – 5 | -4 | 24W | 308 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.