Daily Sunspot Evaluation
Observation Sheet Thursday, 30 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)
- 5
- Number of spots (f)
- 31
- Relative number (R)
- 81
- Observer
- HG
- Reading
- all checks consistent
- File
- 19870730.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAO – 9 | 30 | 05W | 143 | 06W | 10.5 | 47 |
| 2 | BXI – 12 | 21 | 13W | 151 | 14W | ? 56 | 48 |
| 3 | BRX – 3 | -23 | 47W | 185 | 48W | 1 52 | 44 |
| 4 | BXO – 2 | -21 | 37W | 175 | 38W | 3 57 | 49 |
| 5 | CRO – 5 | -29 | 36W | 174 | 37W | 7 58 | 50 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.