Daily Sunspot Evaluation
Observation Sheet Friday, 31 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)
- 12
- Number of spots (f)
- 117
- Relative number (R)
- 237
- Observer
- HÇ0
- Reading
- all checks consistent
- File
- 19910531.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | CAO – 9 | 13 | 42°W | 51 | 44°W | 5.5 | 253 |
| 2 | EKO – 28 | 22 | 39°W | 48 | 41°W | 15.5 | 245 |
| 3 | DAC – 21 | 5 | 22°E | 347 | 20°E | 8° | 253 |
| 4 | AX – 4 | 9 | 27°E | 342 | 25°E | 1° | 254 |
| 5 | ? – 3 | 18 | 85°E | 284 | 83°E | — | 260 |
| 6 | BXO – 5 | -26 | 54°W | 63 | 56°W | 9.5 | 251 |
| 7 | HS – 1 | -15 | 10°W | 19 | 12°W | 2° | 249 |
| 8 | BXO – 5 | -14 | 03°W | 12 | 05°W | 4° | 261 |
| 9 | BXO – 3 | -17 | 12°E | 357 | 10°E | 5° | 262 |
| 10 | DKC – 29 | -10 | 14°E | 355 | 02°E | 7° | 252 |
| 11 | BXO – 5 | -5 | 25°E | 344 | 23°E | 4.5 | 263 |
| 12 | BXO – 4 | -10 | 55°E | 314 | 53°E | 5° | 264 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.