Daily Sunspot Evaluation
Observation Sheet Thursday, 21 April 1983
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)
- 29
- Relative number (R)
- 89
- Observer
- HM
- Reading
- counts consistent, some coordinates doubtful
- File
- 19830421.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DAI – 10 | 111 | 08E | 218 | 05E | 7 | 96 |
| 2 | ? – 2 | -29 | 79W | 305 | 82W | 93 | |
| 3 | CAO – 2 | -6 | 59W | 185 ⚠ | 62W | 6 | 94 |
| 4 | ARX – 3 | -10 | 49W | 235 ⚠ | 52W | 2 | 95 |
| 5 | CAI – 5 | -23 | 83E | 203 ⚠ | 20E | 45 | 98 |
| 6 | CKI – 7 | -11 | 92E | 174 ⚠ | 49E | 6 | 99 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.