Daily Sunspot Evaluation
Observation Sheet Tuesday, 21 May 1991
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)
- 8
- Number of spots (f)
- 43
- Relative number (R)
- 123
- Observer
- TÖ0
- Reading
- all checks consistent
- File
- 19910521.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | AX – 1 | 21 | 18W | 160 | 20W | 240 | |
| 2 | DAI – 14 | 17 | 01E | 141 | 01W | 9.5 | 234 |
| 3 | AX – 1 | -9 | 63W | 205 | 65W | 235 | |
| 4 | AX – 4 | -21 | 15W | 157 | 17W | 2 | 237 |
| 5 | AX – 3 | -29 | 08W | 150 | 10W | 1.5 | 241 |
| 6 | EAC – 12 | -12 | 06W | 148 | 08W | 13 | 232 |
| 7 | HA – 5 | -28 | 40E | 102 | 38E | 2.5 | 238 |
| 8 | AX – 3 | -25 | 58E | 84 | 56E | 2 | 239 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.