Daily Sunspot Evaluation
Observation Sheet Monday, 18 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)
- 6
- Number of spots (f)
- 35
- Relative number (R)
- 95
- Observer
- FA
- Reading
- all checks consistent
- File
- 19710118.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | F – 18 | 18 | 38°E | 224 | |||
| 2 | B – 3 | 18 | 52°E | 210 | |||
| 3 | ? – 5 | 10 | 72E | 190 | |||
| 4 | ? – 6 | -13 | 75°E | 187 | |||
| 5 | J – 1 | 19 | 37°W | 298 | |||
| 6 | B – 2 | 8 | 15W | 276 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.