Daily Sunspot Evaluation
Observation Sheet Thursday, 21 March 2002
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)
- 12
- Number of spots (f)
- 40
- Relative number (R)
- 160
- Observer
- ZFB
- Reading
- all checks consistent
- File
- 20020321.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DSO – 2 | 13 | 43W | 155 | 43W | ~4 | |
| 2 | DRO – 2 | 16 | 37W | 149 | 37W | 4 | |
| 3 | AX – 3 | 17 | 00 | 112 | 00 | ~3 | |
| 4 | BXO – 5 | 9 | 40E | 72 | 40E | 2.5 | |
| 5 | DAO – 4 | 9 | 71E | 41 | 71E | 10 | |
| 6 | ? – 2 | -11 | 76W | 188 | 76W | ~8 | |
| 7 | HS – 1 | -22 | 68W | 180 | 68W | 1.5 | 12 |
| 8 | HS – 2 | -19 | 59W | 171 | 59W | 1 | |
| 9 | DAO – 10 | -20 | 26W | 138 | 26W | 10 | |
| 10 | DAO – 7 | -18 | 41E | 71 | 41E | 8 | |
| 11 | HS – 1 | -15 | 58E | 54 | 58E | ~2 | |
| 12 | AX – 1 | -13 | 66E | 46 | 66E | - |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.