Daily Sunspot Evaluation
Observation Sheet Monday, 13 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)
- 72
- Relative number (R)
- 162
- Observer
- SG0
- Reading
- all checks consistent
- File
- 19910513.jpg
Sunspot groups
| No | Group (class – spots) | B | Δ L | L | Δ Lf | U | Margin no. |
|---|---|---|---|---|---|---|---|
| 1 | DKC – 20 | 30 | 19W | 267 | 22W | 8.5 | 208 |
| 2 | CKO – 6 | 8 | 15W | 263 | 18W | 7.5 | 201 |
| 3 | AX – 1 | 9 | 05W | 253 | 08W | - | 209 |
| 4 | CAO – 10 | 4 | 05W | 253 | 08W | 6 | 212 |
| 5 | CAO – 5 | 15 | 08E | 240 | 05E | 3.5 | 224 |
| 6 | HK – 5 | 10 | 13E | 235 | 10E | 4.5 | 213 |
| 7 | HS – 1 | -27 | 10W | 258 | 13W | 2 | 210 |
| 8 | EKC – 22 | -16 | 14E | 234 | 11E | 11 | 216 |
| 9 | AR – 2 | -11 | 52E | 196 | 49E | 1 | 222 |
Class as written on the sheet (? = group the observer marked as uncertain). ⚠: the coordinates of this row do not agree with each other.