Daily Sunspot Evaluation
Observation Sheet Friday, 10 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)
- 10
- Number of spots (f)
- 93
- Relative number (R)
- 193
- Observer
- HÇ0
- Reading
- all checks consistent
- File
- 19910510.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DKC – 12 | 29 | 20E | 268 | 17E | 8 | 208 |
| 2 | DKO – 11 | 7 | 27E | 261 | 24E | 9.5 | 209 |
| 3 | BRI – 9 | 13 | 32E | 256 | 29E | 9 | 211 |
| 4 | BXI – 9 | 4 | 38E | 250 | 35E | 5.5 | 212 |
| 5 | CAI – 6 | 12 | 61E | 227 | 58E | 10 | 215 |
| 6 | DKC – 29 | -9 | 63W | 351 | 66W | 10.5 | 204 |
| 7 | BRO – 10 | -19 | 54W | 342 | 57W | 5 | 217 |
| 8 | AX – 1 | -17 | 28W | 316 | 31W | - | 218 |
| 9 | HA – 2 | -28 | 30E | 258 | 27E | 1.5 | 210 |
| 10 | BRO – 4 | -17 | 55E | 233 | 52E | 5 | 216 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.