Daily Sunspot Evaluation
Observation Sheet Thursday, 17 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)
- 14
- Number of spots (f)
- 120
- Relative number (R)
- 260
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19800717.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HAX – 2 | 19 | 73W | 280 | 75W | 4 | |
| 2 | CSI – 11 | 20 | 26W | 233 | 28W | 9.5 | |
| 3 | CAO – 9 | 19 | 34E | 171 | 34E | 7.5 | |
| 4 | CAI – 6 | 6 | 47E | 158 | 47E | 8 | |
| 5 | DAI – 15 | 14 | 51E | 156 | 49E | 8 | |
| 6 | AXX – 1 | 23 | 60E | 147 | 58E | - | |
| 7 | BXO – 2 | 16 | 72E | 135 | 70E | 4 | |
| 8 | HAX – 1 | -12 | 70W | 277 | 72W | 2.5 | |
| 9 | EHI – 38 | -11 | 02W | 209 | 04W | 12 | |
| 10 | DJO – 4 | -23 | 01E | 205 | 00 | 5 | |
| 11 | BXO – 11 | -10 | 18E | 189 | 16E | 5.5 | |
| 12 | HKX – 8 | -23 | 36E | 171 | 34E | 6.5 | |
| 13 | EAC – 11 | -20 | 54E | 153 | 52E | 13 | |
| 14 | HJX – 1 | -13 | 81E | 126 | 79E | - |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.