Daily Sunspot Evaluation
Observation Sheet Thursday, 20 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)
- 10
- Number of spots (f)
- 99
- Relative number (R)
- 199
- Observer
- HE
- Reading
- all checks consistent
- File
- 19890720.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HS – 1 | 12 | 44W | 28 | 47W | 1.5 | |
| 2 | BXI – 15 | 26 | 39W | 23 | 42W | 8 | |
| 3 | AX – 5 | 28 | 16W | 0 | 19W | 2.25 | |
| 4 | CAZ – 19 | 19 | 21E | 323 | 18E | 7 | |
| 5 | HH – 2 | 26 | 52E | 292 | 49E | 3 | |
| 6 | CAZ – 10 | 24 | 64E | 280 | 61E | 9 | |
| 7 | AX – 1 | -9 | 11W | 353 | 14W | - | |
| 8 | DKS – 26 | -13 | 24E | 320 | 21E | 8.5 | |
| 9 | DKS – 17 | -22 | 34E | 310 | 31E | 9 | |
| 10 | AX – 3 | -20 | 56E | 288 | 53E | 3 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.