Daily Sunspot Evaluation
Observation Sheet Friday, 21 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)
- 137
- Relative number (R)
- 227
- Observer
- HE
- Reading
- all checks consistent
- File
- 19890721.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HS – 2 | 12 | 59W | 29 | 62W | 2 | |
| 2 | BXI – 8 | 26 | 53W | 23 | 56W | 8 | |
| 3 | BXI – 19 | 28 | 28W | 358 | 31W | 7.5 | |
| 4 | CAE – 25 | 19 | 07E | 323 | 04E | 9 | |
| 5 | HH – 1 | 27 | 40E | 290 | 37E | 3 | |
| 6 | DAE – 19 | 25 | 50E | 280 | 47E | 9.5 | |
| 7 | DAC – 38 | -12 | 09E | 321 | 06E | 7.5 | |
| 8 | DKC – 22 | -21 | 21E | 309 | 18E | 9 | |
| 9 | BRO – 3 | -20 | 42E | 289 | 39E | 2 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.