Daily Sunspot Evaluation
Observation Sheet Monday, 21 May 1990
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)
- 150
- Relative number (R)
- 270
- Observer
- TÖ0
- Reading
- all checks consistent
- File
- 19900521.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HA – 2 | 22 | 70W | 350 | 73W | 4 | 198 |
| 2 | CAO – 4 | 21 | 43W | 323 | 46W | 4 | 211 |
| 3 | AX – 3 | 10 | 39W | 319 | 42W | 2.5 | 212 |
| 4 | DKC – 30 | 35 | 34W | 314 | 37W | 10 | 202 |
| 5 | BXI – 7 | 19 | 14E | 266 | 11E | 4 | 217 |
| 6 | BRI – 15 | 7 | 15E | 265 | 12E | 9.5 | 204 |
| 7 | HS – 1 | 26 | 58E | 222 | 55E | 2 | 213 |
| 8 | AX – 1 | -15 | 50W | 330 | 53W | - | 214 |
| 9 | FKC – 56 | -16 | 29W | 309 | 32W | 17 | 205 |
| 10 | BXI – 7 | -9 | 30E | 250 | 27E | 6 | 209 |
| 11 | DKI – 13 | -19 | 38E | 242 | 35E | 8 | 210 |
| 12 | CKI – 11 | -12 | 46E | 234 | 43E | 9 | 216 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.