Daily Sunspot Evaluation
Observation Sheet Friday, 13 July 1984
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)
- 4
- Number of spots (f)
- 19
- Relative number (R)
- 59
- Observer
- AÖ0
- Reading
- all checks consistent
- File
- 19840713.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | ARX – 1 | -4 | 60W | 118 | 63W | 0.25 | 1025 |
| 2 | CAO – 11 | -9 | 07W | 65 | 10W | 9.5 | 1027 |
| 3 | AXX – 4 | -8 | 29E | 29 | 26E | 2 | 1028 |
| 4 | AXX – 3 | -16 | 57E | 1 | 54E | 1.5 | 1030 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.