Daily Sunspot Evaluation
Observation Sheet Friday, 17 September 1993
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)
- 2
- Number of spots (f)
- 12
- Relative number (R)
- 32
- Observer
- MB
- Reading
- all checks consistent
- File
- 19930917.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CRI – 5 | -21 | 01E | 79 | 02W | 3 | 235 |
| 2 | BXO – 7 | -11 | 42E | 38 | 39E | 1.5 | 234 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.