Daily Sunspot Evaluation
Observation Sheet Thursday, 23 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)
- 7
- Number of spots (f)
- 46
- Relative number (R)
- 116
- Observer
- FL
- Reading
- all checks consistent
- File
- 19870723.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AXX – 1 | 21 | 20W | 253 | 28W | 0.53 | 43 |
| 2 | HAX – 1 | 28 | 80E | 153 | 77E | 1.55 | 47 |
| 3 | CAI – 8 | -19 | 08E | 225 | 05E | 5.53 | 45 |
| 4 | BXO – 3 | -20 | 38E | 195 | 35E | 3.54 | 46 |
| 5 | DAI – 11 | -23 | 48E | 185 | 45E | 7.52 | 49 |
| 6 | DAC – 17 | -28 | 21W | 254 | 24W | 8.550 | 47 |
| 7 | HKX – 5 | -33 | 08W | 241 | 11W | 3.49 | 41 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.