Daily Sunspot Evaluation
Observation Sheet Wednesday, 20 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)
- 6
- Number of spots (f)
- 27
- Relative number (R)
- 87
- Observer
- MB
- Reading
- all checks consistent
- File
- 19900620.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BRI – 14 | 8 | 35W | 279 | 38W | 6 | 252 |
| 2 | HH – 1 | -15 | 70W | 314 | 73W | 4 | 241 |
| 3 | BRO – 3 | -6 | 38W | 282 | 41W | 3 | 260 |
| 4 | BRO – 6 | -30 | 37W | 281 | 40W | 14 | 259 |
| 5 | HS – 2 | -9 | 15W | 259 | 18W | 2 | 253 |
| 6 | AF – 1 | -8 | 04E | 240 | 01E | - | 261 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.