Daily Sunspot Evaluation
Observation Sheet Thursday, 21 July 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)
- 7
- Number of spots (f)
- 59
- Relative number (R)
- 129
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19830721.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HAX – 4 | 13 | 25W | 128 | 28W | 2 | 197 |
| 2 | DAI – 18 | 8 | 09E | 94 | 06E | 7 | 211 |
| 3 | CAI – 7 | 10 | 20E | 83 | 17E | 6 | 207 |
| 4 | HAX – 1 | -5 | 46W | 149 | 49W | 1 | 202 |
| 5 | DAI – 21 | -10 | 41W | 144 | 44W | 9.5 | 206 |
| 6 | CAI – 6 | -4 | 32W | 135 | 35W | 4 | 205 |
| 7 | HSX – 2 | -6 | 09E | 94 | 06E | 1 | 212 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.