Daily Sunspot Evaluation
Observation Sheet Sunday, 17 June 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)
- 8
- Number of spots (f)
- 66
- Relative number (R)
- 146
- Observer
- YK
- Reading
- all checks consistent
- File
- 19900617.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAO – 7 | 29 | 35W | 317 | 37W | 7 | 254 |
| 2 | BRI – 16 | 8 | 03E | 279 | 01E | 7 | 252 |
| 3 | AX – 3 | 13 | 07E | 275 | 05E | 1 | 255 |
| 4 | HK – 9 | -14 | 30W | 312 | 32W | 6.5 | 24 |
| 5 | AX – 3 | -28 | 23W | 305 | 25W | 2 | 256 |
| 6 | AX – 2 | -37 | 11W | 293 | 13W | 1 | 257 |
| 7 | DAI – 12 | -31 | 02E | 280 | 00 | 11 | 250 |
| 8 | CAI – 14 | -10 | 27E | 255 | 25E | 9 | 253 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.