Daily Sunspot Evaluation
Observation Sheet Friday, 15 January 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)
- 11
- Relative number (R)
- 51
- Observer
- HA
- Reading
- all checks consistent
- File
- 19710115.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | J – 1 | 19 | 02E | 299 | |||
| 2 | ? – 2 | 17 | 73E | 228 | |||
| 3 | H – 4 | -6 | 68W | 9 | |||
| 4 | J – 4 | 10 | 20W | 321 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.