Daily Sunspot Evaluation
Observation Sheet Friday, 18 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)
- 17
- Number of spots (f)
- 147
- Relative number (R)
- 317
- Observer
- TÖ
- Reading
- all checks consistent
- File
- 19800718.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAE – 9 | 20 | 37W | 232 | 40W | 10.5 | |
| 2 | AXX – 1 | 17 | 12W | 207 | 15W | - | |
| 3 | AXX – 1 | 8 | 12E | 183 | 09E | - | |
| 4 | AXX – 2 | 13 | 17E | 178 | 14E | - | |
| 5 | CAO – 2 | 18 | 23E | 172 | 20E | 7 | |
| 6 | BAX – 3 | 6 | 34E | 161 | 31E | 1 | |
| 7 | DAI – 17 | 13 | 40E | 155 | 37E | 8.5 | |
| 8 | AXX – 2 | 27 | 44E | 151 | 41E | 1 | |
| 9 | AXX – 1 | 16 | 61E | 134 | 58E | - | |
| 10 | ? – 1 | -12 | 81W | 276 | 84W | 1 | |
| 11 | EHE – 42 | -11 | 13W | 208 | 16W | 11.5 | |
| 12 | CAE – 7 | -23 | 10W | 205 | 13W | 6 | |
| 13 | BAO – 13 | -11 | 07E | 188 | 04E | 7.5 | E |
| 14 | HEE – 24 | -23 | 25E | 170 | 22E | 6.5 | |
| 15 | EAE – 18 | -21 | 42E | 153 | 39E | 14 | |
| 16 | HAO – 2 | -12 | 72E | 123 | 69E | 5 | |
| 17 | ? – 2 | -19 | 79E | 116 | 76E | 1.5 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.