Daily Sunspot Evaluation
Observation Sheet Friday, 17 July 1970
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)
- 7
- Number of spots (f)
- 37
- Relative number (R)
- 107
- Observer
- MA
- Reading
- counts consistent, some coordinates doubtful
- File
- 19700717.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | A – 1 | 16 | 44E | 139 | |||
| 2 | G – 6 | -17 | 11W | 194 | |||
| 3 | J – 3 | 4 | 56W | 239 | |||
| 4 | ? – 1 | 17 | 82W | 265 | |||
| 5 | J – 10 | 12 | 45W | 208 ⚠ | |||
| 6 | C – 9 | 17 | 23W | 206 | |||
| 7 | A – 7 | 10 | 44W | 107 ⚠ |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.