Daily Sunspot Evaluation
Observation Sheet Tuesday, 18 July 1989
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)
- 9
- Number of spots (f)
- 75
- Relative number (R)
- 165
- Observer
- HÇ
- Reading
- all checks consistent
- File
- 19890718.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HS – 3 | 13 | 16W | 27 | 19W | 2.5 | |
| 2 | CAI – 29 | 28 | 09W | 20 | 12W | 14 | |
| 3 | AX – 2 | 18 | 08E | 3 | 06E | - | |
| 4 | BXI – 9 | 19 | 47E | 324 | 44E | 8 | |
| 5 | HS – 1 | 25 | 78E | 293 | 75E | 2 | |
| 6 | HH – 6 | -19 | 68W | 79 | 71W | 4.5 | |
| 7 | BXO – 6 | -15 | 13E | 358 | 10E | 5.5 | |
| 8 | HK – 6 | -13 | 49E | 322 | 46E | 4 | |
| 9 | EAC – 13 | -22 | 60E | 311 | 57E | 11 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.