Daily Sunspot Evaluation
Observation Sheet Sunday, 15 July 1990
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)
- 67
- Relative number (R)
- 157
- Observer
- YK
- Reading
- all checks consistent
- File
- 19900715.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAI – 16 | 16 | 55W | 328 | 58W | 13 | 298 |
| 2 | DAI – 19 | 7 | 48W | 321 | 51W | 10 | 299 |
| 3 | AX – 3 | 13 | 19W | 292 | 22W | 1 | 293 |
| 4 | BXI – 10 | 19 | 11E | 262 | 08E | 5 | 305 |
| 5 | AX – 4 | 1 | 60E | 213 | 57E | 3.5 | 304 |
| 6 | HA – 1 | 11 | 61E | 212 | 58E | 2.5 | 305 |
| 7 | CAI – 10 | -9 | 48W | 319 | 49W | 6.5 | 300 |
| 8 | AR – 2 | -15 | 35W | 308 | 38W | 0.5 | 288 |
| 9 | AX – 2 | -6 | 09E | 264 | 06E | 0.5 | 302 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.