Daily Sunspot Evaluation
Observation Sheet Thursday, 16 July 1987
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)
- 2
- Number of spots (f)
- 4
- Relative number (R)
- 24
- Observer
- HG
- Reading
- counts consistent, some coordinates doubtful
- File
- 19870716.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AXX – 2 | 27 | 63W | 27 ⚠ | 65W | 3 | 40 |
| 2 | ? – 2 | -31 | 77E | 217 ⚠ | 75E | 6 | 41 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.