Daily Sunspot Evaluation
Observation Sheet Monday, 17 May 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)
- 20
- Relative number (R)
- 80
- Observer
- MA
- Reading
- all checks consistent
- File
- 19710517.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ? – 1 | 18 | 72E | 58 | |||
| 2 | B – 3 | -5 | 60W | 190 | |||
| 3 | A – 1 | 20 | 65W | 195 | |||
| 4 | J – 1 | 13 | 16W | 146 | |||
| 5 | A – 1 | 8 | 09W | 139 | |||
| 6 | G – 13 | 6 | 02W | 132 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.