Daily Sunspot Evaluation
Observation Sheet Thursday, 17 February 2005
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)
- 5
- Number of spots (f)
- 41
- Relative number (R)
- 91
- Observer
- MS
- Reading
- counts consistent, some coordinates doubtful
- File
- 20050217.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HS – 1 | 14 | 72W | 180 | 72W | 0.5 | |
| 2 | HA – 7 | -9 | 46W | 154 | 46W | ~3.5 | |
| 3 | HA – 2 | -5 | 29W | 137 | 29W | 1.5 | |
| 4 | HH – 30 | -9 | 12W | 120 | 12W | ~8 | |
| 5 | AX – 1 | -13 | 59E | 163 ⚠ | 55E |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.