Daily Sunspot Evaluation
Observation Sheet Friday, 17 April 1992
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)
- 70
- Relative number (R)
- 150
- Observer
- TÖ0
- Reading
- counts consistent, some coordinates doubtful
- File
- 19920417.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAO – 6 | 9 | 11W | 93 | 14W | 10 | 162 |
| 2 | BXO – 6 | 2 | 46E | 36 | 43E | 80 | 160 |
| 3 | AX – 1 | 20 | 74E | 8 | 71E | - | 168 |
| 4 | HA – 1 | -15 | 07W | 149 ⚠ | 70W | 2 | 156 |
| 5 | HH – 6 | -14 | 29W | 109 | 30W | 5 | 158 |
| 6 | CAO – 16 | -19 | 04W | 86 | 07W | 6 | 165 |
| 7 | BAI – 33 | -27 | 38E | 44 | 35E | 15 | 161 |
| 8 | ? – 1 | -15 | 75E | 7 | 72E | 2 | 167 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.