Daily Sunspot Evaluation
Observation Sheet Monday, 21 July 1980
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)
- 16
- Number of spots (f)
- 150
- Relative number (R)
- 310
- Observer
- TÖ
- Reading
- counts consistent, some coordinates doubtful
- File
- 19800721.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HAI – 1 | 19 | 78W | 233 | 81W | 3 | |
| 2 | DAO – 10 | 7 | 29W | 184 | 32W | 4.5 | |
| 3 | CAI – 10 | 19 | 17W | 172 | 20W | 4 | |
| 4 | CAO – 6 | 4 | 04W | 159 | 07W | 4.5 | |
| 5 | CEI – 11 | 14 | 02W | 157 | 05W | 5 | |
| 6 | BEO – 8 | 27 | 06E | 149 | 03E | 6 | 436 |
| 7 | BEI – 17 | 17 | 21E | 133 | 19E | 7.5 | |
| 8 | DEI – 10 | -12 | 55W | 210 | 58W | 10 | |
| 9 | AEI – 1 | -24 | 53W | 208 | 56W | 1 | |
| 10 | CAO – 9 | -25 | 43W | 198 | 47W | 7.5 | |
| 11 | HEI – 14 | -25 | 15W | 170 | 18W | 7.5 | 437 |
| 12 | DAC – 23 | -20 | 01W | 157 | 05W | 7 | 438 |
| 13 | AEI – 4 | -27 | 01E | 154 | 02W | - | |
| 14 | DJO – 4 | -12 | 32E | 123 | 24E | 21 | |
| 15 | DEE – 19 | -18 | 34E | 116 ⚠ | 36E | 4.5 | |
| 16 | BAE – 3 | -8 | 48E | 107 | 45E | 5.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.