Daily Sunspot Evaluation
Observation Sheet Friday, 20 July 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)
- 12
- Number of spots (f)
- 74
- Relative number (R)
- 194
- Observer
- MS
- Reading
- all checks consistent
- File
- 20010720.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BXO – 2 | 10 | 78W | 171 | 80W | ~7 | |
| 2 | HS – 1 | 5 | 49W | 142 | 51W | ~2.5 | |
| 3 | HA – 3 | 16 | 28W | 121 | 30W | 5 | |
| 4 | CAO – 3 | 19 | 16W | 109 | 18W | ~3 | |
| 5 | BXI – 10 | 8 | 08E | 85 | 06E | 5.5 | |
| 6 | CRO – 12 | 16 | 32E | 61 | 30E | 5 | |
| 7 | HA – 1 | -21 | 80W | 173 | 82W | ~2 | |
| 8 | AX – 1 | -9 | 72W | 165 | 74W | - | |
| 9 | AX – 3 | -22 | 42W | 135 | 44W | ~2 | |
| 10 | HR – 3 | -15 | 08E | 85 | 06E | ~1 | |
| 11 | BXI – 7 | -18 | 16E | 77 | 14E | ~5.5 | |
| 12 | EAC – 28 | -23 | 18E | 75 | 16E | 15 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.