Daily Sunspot Evaluation
Observation Sheet Friday, 21 December 2001
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)
- 33
- Relative number (R)
- 83
- Observer
- SB0
- Reading
- counts consistent, some coordinates doubtful
- File
- 20011221.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HS – 1 | 12 | 28W | 334 ⚠ | 2 | ||
| 2 | HH – 3 | 12 | 50W | 306 | 4 | ||
| 3 | HS – 3 | -25 | 40W | 302 ⚠ | 2.5 | ||
| 4 | DAS – 18 | -18 | 19W | 275 | 8 | ||
| 5 | DRO – 8 | -12 | 14E | 242 | 9 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.