Daily Sunspot Evaluation
Observation Sheet Thursday, 17 June 1999
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)
- 61
- Relative number (R)
- 131
- Observer
- NA
- Reading
- all checks consistent
- File
- 19990617.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | FAF – 21 | 27 | 38W | 136 | 41W | ~11.5 | |
| 2 | OSO – 5 | 39 | 29E | 71 | 24E | ~8.5 | D10-5 |
| 3 | BXO – 5 | 13 | 23E | 75 | 20E | ~3 | |
| 4 | ? – 1 | -31 | 75W | 173 | 78W | ? | |
| 5 | HK – 9 | -21 | 27W | 125 | 30W | ~4 | |
| 6 | DAI – 10 | -13 | 00 | 98 | 03W | ~7.5 | D10-20 |
| 7 | CAI – 10 | -22 | 02E | 96 | 01W | 10.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.