Daily Sunspot Evaluation
Observation Sheet Tuesday, 21 August 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)
- 11
- Number of spots (f)
- 89
- Relative number (R)
- 199
- Observer
- ZFB
- Reading
- all checks consistent
- File
- 20010821.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HS – 1 | 10 | 50W | 79 | 52W | ~2 | |
| 2 | BXO – 5 | 16 | 25W | 54 | 27W | 3 | |
| 3 | HS – 1 | 25 | 08W | 37 | 10W | ~2 | |
| 4 | DSI – 36 | 29 | 03E | 26 | 01E | ~9.7 | |
| 5 | DKC – 38 | 15 | 19E | 10 | 17E | 9.5 | |
| 6 | ? – 1 | -53 | 72W | 101 | 74W | ? | |
| 7 | BXO – 3 | -13 | 02E | 27 | 00 | ~5 | |
| 8 | ? – 1 | -10 | 10E | 19 | 08E | 0.5 | |
| 9 | AX – 1 | -6 | 56E | 333 | 54E | - | |
| 10 | ? – 1 | -28 | 73E | 316 | 71E | ~3 | |
| 11 | ? – 1 | -16 | 79E | 310 | 77E | ~2 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.