Daily Sunspot Evaluation
Observation Sheet Thursday, 18 November 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)
- 16
- Relative number (R)
- 56
- Observer
- HM
- Reading
- counts consistent, some coordinates doubtful
- File
- 19711118.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | H – 1 | -6 | 76E | 132 | |||
| 2 | H – 6 | -14 | 16E | 132 ⚠ | |||
| 3 | J – 2 | -12 | 56W | 264 | |||
| 4 | A – 7 | 9 | 20W | 228 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.