Daily Sunspot Evaluation
Observation Sheet Friday, 17 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)
- 9
- Number of spots (f)
- 49
- Relative number (R)
- 139
- Observer
- HÇ0
- Reading
- all checks consistent
- File
- 19910517.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | HA – 2 | 8 | 71W | 267 | 74W | 2.5 | 203 |
| 2 | DKC – 9 | 31 | 70W | 266 | 73W | 10° | 208 |
| 3 | AX – 1 | 4 | 61W | 257 | 64W | 0.5 | 212 |
| 4 | HA – 5 | 11 | 41W | 237 | 44W | 4 | 215 |
| 5 | CAI – 10 | 13 | 07W | 203 | 10W | 6.5 | 230 |
| 6 | HA – 1 | -28 | 61W | 257 | 64W | 1.5 | 240 |
| 7 | HA – 4 | -17 | 38W | 234 | 41W | 3.5 | 213 |
| 8 | AX – 3 | -8 | 32W | 228 | 35W | 3° | 229 |
| 9 | EKC – 14 | -13 | 49E | 147 | 46E | 12° | 232 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.