Daily Sunspot Evaluation
Observation Sheet Thursday, 9 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)
- 65
- Relative number (R)
- 165
- Observer
- SG0
- Reading
- all checks consistent
- File
- 19910509.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | BRO – 5 | 23 | 48W | 350 | 51W | 4 | 214 |
| 2 | DKC – 11 | 29 | 32E | 270 | 29E | 10 | 208 |
| 3 | DAI – 9 | 7 | 41E | 261 | 38E | 10 | 209 |
| 4 | CAI – 11 | 14 | 44E | 258 | 41E | 8 | 211 |
| 5 | BRO – 5 | 4 | 52E | 250 | 49E | 8 | 232 |
| 6 | DKO – 5 | 12 | 73E | 229 | 70E | 11 | 215 |
| 7 | ? – 1 | -23 | 82W | 24 | 85W | - | 193 |
| 8 | DKC – 14 | -9 | 50W | 352 | 53W | 10.5 | 204 |
| 9 | HA – 1 | -27 | 42E | 260 | 39E | 1 | 210 |
| 10 | CAO – 3 | -17 | 66E | 236 | 63E | 6 | 216 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.