Daily Sunspot Evaluation
Observation Sheet Monday, 17 June 1991
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)
- 11
- Number of spots (f)
- 87
- Relative number (R)
- 197
- Observer
- TA
- Reading
- all checks consistent
- File
- 19910617.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXI – 19 | 12 | 64W | 210 | 67W | 8 | 307 |
| 2 | DAC – 9 | 8 | 58E | 88 | 57E | 9 | 302 |
| 3 | AR – 1 | -13 | 69W | 215 | 72W | 0.5 | 308 |
| 4 | CAO – 3 | -6 | 42W | 188 | 45W | 5 | 296 |
| 5 | BXI – 7 | -16 | 21W | 167 | 24W | 3 | 305 |
| 6 | BRI – 6 | -22 | 17W | 163 | 20W | 9 | 235 |
| 7 | AR – 2 | -13 | 07W | 153 | 10W | 0.5 | 306 |
| 8 | BRO – 7 | -15 | 03E | 143 | 00 | 3.5 | 300 |
| 9 | CAI – 24 | -12 | 13E | 133 | 10E | 8 | 304 |
| 10 | CAO – 8 | -29 | 33E | 113 | 30E | 4 | 301 |
| 11 | AX – 1 | -16 | 62E | 84 | 59E | 0.5 | 303 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.