Daily Sunspot Evaluation
Observation Sheet Thursday, 19 July 1990
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)
- 27
- Relative number (R)
- 67
- Observer
- HÇ0
- Reading
- all checks consistent
- File
- 19900719.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AR – 2 | 18 | 45W | 265 | 48W | 1 | 333 |
| 2 | CSO – 3 | 12 | 09E | 211 | 06E | 4 | 325 |
| 3 | ? – 1 | 9 | 74E | 146 | 71E | 3 | 311 |
| 4 | EKC – 21 | -28 | 53E | 167 | 50E | 14 | 310 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.